Animals That Start with J: From Jaguars to Jerboas

This article covers animals whose common English names begin with the letter J, including the jaguar, jerboa, Japanese macaque, and several other species. For each animal, you will find details on taxonomy, physical characteristics, behavior, habitat, diet, conservation status, and practical observations relevant to those who work with or study these species. The information is organized for students, researchers, life-science professionals, and informed general readers who need a reliable alphabetical reference with concrete biological and ecological data.

Scope and Selection Criteria

The animals included in this article share the common English name beginning with J. Common names vary by region and language, so this list follows widely accepted English nomenclature used in scientific literature and field guides. The selection includes mammals, birds, reptiles, fish, and invertebrates to represent the diversity of J-named animals across taxonomic groups.

Some animals have multiple common names, and only those most frequently recognized as starting with J are included. For example, the jaguar is also called the onça in Portuguese-speaking regions, but the English common name begins with J. Similarly, the Japanese macaque is sometimes called the snow monkey, but the standard English name begins with J.

At a Glance

The table below summarizes key facts for the primary J-named animals covered in this article. Use this table for quick reference when comparing species characteristics.

Jaguar

The jaguar (Panthera onca) is the largest cat species in the Americas and the third largest cat worldwide after the tiger and lion. Adult males typically weigh between 60 and 100 kilograms, while females are smaller, usually ranging from 40 to 80 kilograms. Body length varies from 1.2 to 1.9 meters excluding the tail, which adds another 45 to 75 centimeters.

Physical Characteristics and Adaptations

Jaguars have a robust, muscular build with a broad head and powerful jaws. Their coat is typically yellow-brown with black rosettes that have spots in the center, distinguishing them from leopards which have rosettes without central spots. Melanistic jaguars, often called black panthers, occur due to a genetic mutation that produces excess dark pigment.

The jaguar has the strongest bite force relative to body size among big cats. This adaptation allows it to pierce the skulls of prey, a hunting strategy unique among large felids. The bite force enables jaguars to take down armored prey such as caimans, turtles, and armadillos.

Habitat and Range

Jaguars historically ranged from the southwestern United States through Central America and into South America as far south as northern Argentina. Today, the species has been extirpated from much of its northern range, with occasional sightings in Arizona and New Mexico. The Amazon Basin holds the largest remaining population.

Jaguars prefer dense rainforest but also inhabit seasonally flooded wetlands, dry deciduous forests, and grassland savannas. They are strong swimmers and often live near water sources. In the Pantanal wetlands of Brazil, jaguars have adapted to an aquatic hunting lifestyle, preying on caiman and capybara.

Behavior and Diet

Jaguars are solitary and territorial. Males maintain territories that may overlap those of several females. They communicate through scent marking, vocalizations including roars and grunts, and visual signals. Activity patterns vary by region, with jaguars in remote areas often active during the day while those near human activity become more nocturnal.

The diet includes more than 85 species. Jaguars prey on deer, peccaries, capybaras, tapirs, and larger animals such as cattle in areas where livestock is available. They also consume smaller prey including monkeys, birds, fish, and reptiles. The powerful bite allows them to kill prey by piercing the skull or cervical vertebrae.

Conservation Status and Threats

The International Union for Conservation of Nature lists the jaguar as Near Threatened. Population estimates suggest approximately 173,000 mature individuals remain, with numbers declining in some regions. Primary threats include habitat loss from deforestation, fragmentation of populations, and conflict with livestock owners who kill jaguars in retaliation for predation.

Conservation efforts focus on maintaining habitat connectivity through wildlife corridors, reducing human-wildlife conflict through improved livestock management, and combating poaching. The jaguar is listed in Appendix I of the Convention on International Trade in Endangered Species, prohibiting international trade in the species or its parts.

Jerboa

Jerboas are small rodents in the family Dipodidae, comprising approximately 33 species across 10 genera. They inhabit deserts and arid grasslands across North Africa, the Middle East, and Central Asia. Their most distinctive feature is the elongated hind legs that enable bipedal hopping locomotion similar to kangaroos.

Physical Adaptations for Desert Life

Jerboas have hind legs that are four times longer than their front legs. The feet have three toes with tufts of hair that provide traction on sandy surfaces. The tail is longer than the body and serves as a balancing organ during hopping and as a prop when the animal sits upright.

The ears of many jerboa species are large relative to body size, aiding in heat dissipation and detection of predators. The fur is typically sandy or pale brown, providing camouflage in desert environments. Some species have fur on the soles of their feet to protect against hot sand.

Behavior and Ecology

Jerboas are nocturnal, emerging from burrows after sunset to forage. They are omnivorous, feeding on seeds, plant material, and insects. The diet varies seasonally, with seeds dominating during dry periods and green vegetation and insects consumed when available.

Burrowing behavior is central to jerboa survival. Burrows provide refuge from extreme temperatures and predators. Some species construct complex burrow systems with separate chambers for nesting, food storage, and waste. During winter, some jerboa species enter torpor, a state of reduced metabolic activity, to conserve energy when food is scarce.

Jerboas do not drink water directly. They obtain sufficient moisture from their food through metabolic water production, the water generated during the breakdown of carbohydrates and fats. This adaptation allows them to survive in environments where free water is unavailable.

Species Diversity and Conservation

The long-eared jerboa (Euchoreutes naso) is notable for its extremely long ears that extend beyond the head. The Gobi jerboa (Allactaga bullata) inhabits the Gobi Desert of Mongolia and China. The Egyptian jerboa (Jaculus jaculus) ranges across North Africa and the Middle East.

Conservation status varies by species. The IUCN lists several jerboa species as Data Deficient due to limited population information. Habitat degradation from overgrazing, agricultural expansion, and climate change poses threats to some populations. The long-eared jerboa is listed as Endangered due to habitat loss in its limited range.

Japanese Macaque

The Japanese macaque (Macaca fuscata) is the northernmost non-human primate species in the world. Also known as the snow monkey, this species inhabits forests across Japan, from the subtropical southern islands to the cold northern regions of Honshu.

Physical Characteristics

Japanese macaques have a stocky build with a gray-brown coat that becomes thicker and darker in winter. The face, hands, and buttocks are bare and pink to red in color. Adult males weigh 10 to 14 kilograms, while females weigh 5.5 to 8 kilograms. Body length ranges from 47 to 60 centimeters for males and 42 to 52 centimeters for females, with tails of 8 to 12 centimeters.

Social Structure and Behavior

Japanese macaques live in matrilineal social groups of 20 to 100 individuals. Females remain in their natal group throughout life, while males disperse to other groups upon reaching sexual maturity. Social hierarchies are stable, with rank inherited from the mother. High-ranking individuals have priority access to food and grooming partners.

The species is famous for cultural behavior transmission. In 1953, a young female on Koshima Island began washing sweet potatoes in seawater before eating them. This behavior spread through the group and persists today. Similarly, some troops in Jigokudani Monkey Park bathe in hot springs during winter, a behavior that has been passed down through generations.

Diet and Habitat

Japanese macaques are omnivorous and highly adaptable. Their diet includes fruits, seeds, leaves, bark, roots, insects, and small animals. In agricultural areas, they may raid crops, leading to conflict with farmers. In northern regions, they rely on bark and buds during winter when other food is scarce.

The species occupies a wide range of habitats including subtropical forests, temperate deciduous forests, and subalpine coniferous forests. They are found from sea level to elevations above 1,500 meters. The Jigokudani troop in Nagano Prefecture is a popular tourist attraction where visitors observe macaques bathing in geothermal hot springs.

Conservation Status

The IUCN lists the Japanese macaque as Least Concern. The population is estimated at over 100,000 individuals. However, some local populations are threatened by habitat fragmentation, road mortality, and conflict with agricultural interests. The species is protected under Japanese law, and management programs exist to control crop damage while maintaining viable populations.

Javan Rhinoceros

The Javan rhinoceros (Rhinoceros sondaicus) is one of the most endangered large mammals on Earth. Fewer than 80 individuals survive, all confined to Ujung Kulon National Park on the western tip of Java, Indonesia. A small population may persist in Vietnam, but the last confirmed sighting there was in 2010, and the subspecies is presumed extinct.

Physical Characteristics

The Javan rhinoceros is smaller than the Indian rhinoceros, with adult males weighing 900 to 2,300 kilograms and females 700 to 1,500 kilograms. Body length ranges from 3.1 to 3.2 meters, with a shoulder height of 1.4 to 1.7 meters. The skin is gray-brown with loose folds that resemble armor plating.

Males have a single horn of 10 to 25 centimeters, while females typically have a small bump or no horn at all. The upper lip is prehensile, adapted for grasping vegetation. The species has 24 premolar and molar teeth adapted for grinding plant material.

Habitat and Diet

Javan rhinos inhabit dense lowland rainforest, often near water sources such as rivers, mud wallows, and coastal areas. They are browsers, feeding on leaves, twigs, fruits, and fallen vegetation. The diet includes more than 150 plant species, with a preference for pioneer species that grow in disturbed areas.

The species is solitary except for mothers with calves. Home ranges vary from 3 to 20 square kilometers depending on habitat quality and population density. Javan rhinos are most active during the morning and evening, resting during the hottest part of the day.

Conservation Challenges

The entire population of Javan rhinos exists in a single site, making the species extremely vulnerable to disease outbreaks, natural disasters, and genetic bottlenecks. The 2018 tsunami that struck the Ujung Kulon coastline killed 68 people and raised concerns about the rhino population, though no rhinos were confirmed dead.

Conservation efforts focus on habitat management, monitoring through camera traps and fecal DNA analysis, and maintaining the genetic health of the population. The Indonesian government has designated Ujung Kulon as a national park and World Heritage Site. Translocation to a second site has been discussed but carries significant risks given the small population size.

Jackrabbit

Jackrabbits are hares in the genus Lepus, native to North America. Despite the name, they are not rabbits but hares, distinguished by their longer ears, larger body size, and young that are born fully furred with open eyes. Five species are commonly recognized: the black-tailed jackrabbit, white-tailed jackrabbit, antelope jackrabbit, and two additional species in Mexico.

Physical Characteristics

Jackrabbits have extremely long ears that can reach 15 to 20 centimeters in length. The ears serve multiple functions including thermoregulation, hearing, and communication. Blood vessels in the ears dilate to release heat in hot conditions and constrict to conserve heat in cold conditions.

Body weight ranges from 1.5 to 5 kilograms depending on species. The black-tailed jackrabbit (Lepus californicus) is the most widespread, ranging from the central United States to Mexico. The white-tailed jackrabbit (Lepus townsendii) inhabits the northern Great Plains and Rocky Mountains, turning white in winter.

Behavior and Ecology

Jackrabbits are primarily nocturnal and crepuscular, resting in shallow depressions called forms during the day. They are solitary except during breeding season. When threatened, they rely on their speed, reaching up to 55 kilometers per hour, and their ability to make sharp turns to evade predators.

The diet consists of grasses, forbs, shrubs, and agricultural crops. In desert regions, jackrabbits consume cacti and other succulent plants to obtain water. They are important prey for many predators including coyotes, bobcats, eagles, and hawks.

Jackrabbits have high reproductive rates. Females can produce multiple litters per year, with litter sizes of 1 to 6 young. The young are precocial, able to move shortly after birth. Population numbers fluctuate dramatically in response to food availability, disease, and predation pressure.

Management Considerations

In agricultural areas, jackrabbits can cause significant crop damage, particularly to alfalfa, orchards, and vegetable crops. Population control measures include habitat modification, exclusion fencing, and regulated hunting. Landowners should monitor jackrabbit populations and implement control measures before damage becomes severe.

Jellyfish

Jellyfish are free-swimming marine animals in the phylum Cnidaria, class Scyphozoa, with additional species in classes Cubozoa and Hydrozoa. They are found in all oceans, from surface waters to the deep sea, and in some freshwater environments.

Body Structure and Life Cycle

Jellyfish have a gelatinous bell-shaped body called a medusa, with tentacles extending downward. The body is composed of approximately 95 percent water. They lack a brain, heart, and bones, relying on a simple nerve net for coordination.

The life cycle alternates between sessile polyp and free-swimming medusa stages. Polyps attach to the seafloor and reproduce asexually, releasing juvenile medusae called ephyrae. The medusa stage reproduces sexually, releasing eggs and sperm into the water column. Some species, including the immortal jellyfish (Turritopsis dohrnii), can revert from the medusa stage back to the polyp stage, potentially achieving biological immortality.

Stinging Cells and Venom

Jellyfish capture prey using specialized cells called nematocysts, which contain coiled, barbed threads that discharge on contact. The venom varies by species, ranging from mild irritation to potentially fatal effects in humans. The box jellyfish (Chironex fleckeri) found in Australian waters is considered one of the most venomous animals in the world.

Ecological Role and Blooms

Jellyfish are important predators of zooplankton, fish larvae, and small crustaceans. They are also prey for sea turtles, ocean sunfish, and some seabirds. Jellyfish blooms, rapid increases in population, can have significant ecological and economic impacts, including interference with fishing, clogging of cooling water intakes for power plants, and impacts on tourism.

Public Health Considerations

Jellyfish stings are a common public health concern in coastal areas. Treatment varies by species, and accurate identification is important for appropriate management. Vinegar is recommended for box jellyfish stings in some regions, while other species may require different treatments. Severe stings can cause anaphylaxis and require immediate medical attention.

Junco

Juncos are small sparrows in the genus Junco, family Passerellidae. Five species are recognized, with the dark-eyed junco (Junco hyemalis) being the most widespread and variable. Juncos are familiar winter visitors to backyards across North America.

Physical Characteristics and Variation

Dark-eyed juncos show considerable geographic variation in plumage. The slate-colored form, common in the eastern United States and Canada, has a dark gray hood, brown back, and white belly. The Oregon form, found in the western United States, has a black hood, brown back, and rufous flanks. Other forms include the pink-sided, gray-headed, and white-winged varieties.

Body length ranges from 13 to 17 centimeters, with a wingspan of 18 to 25 centimeters. Weight ranges from 18 to 30 grams. The white outer tail feathers are a distinctive field mark, flashing during flight.

Habitat and Behavior

Juncos breed in coniferous and mixed forests across Canada, Alaska, and mountainous regions of the western United States. In winter, they migrate to lower elevations and more southern latitudes, where they frequent woodland edges, fields, and suburban backyards.

Juncos are ground feeders, foraging for seeds and insects on the soil surface. They are social in winter, forming flocks that may include other sparrow species. At backyard feeders, they prefer to feed on the ground beneath hanging feeders.

Breeding and Life History

Juncos typically produce two broods per year. The female builds a cup nest on the ground, often concealed under vegetation or roots. Clutch size ranges from 3 to 6 eggs, incubated for 12 to 13 days. The young fledge 9 to 13 days after hatching.

The species is listed as Least Concern by the IUCN, with a large and stable population estimated at over 200 million individuals. Their adaptability to human-modified landscapes has contributed to their success.

Additional J-Named Animals

Several other animals with common names beginning with J merit brief mention for completeness.

Japanese Serow

The Japanese serow (Capricornis crispus) is a goat-antelope found in forested mountains across Japan. It is a medium-sized ungulate weighing 30 to 45 kilograms, with a stocky build and short legs adapted for steep terrain. The species is protected as a special natural monument in Japan.

Junglefowl

The red junglefowl (Gallus gallus) is the wild ancestor of the domestic chicken. It inhabits forests and scrublands across South and Southeast Asia. Males have striking plumage with iridescent green-black tail feathers and a red comb and wattles. The species is important for understanding the domestication of poultry.

Jackal

Jackals are medium-sized canids in the genus Canis, with three species: golden jackal, side-striped jackal, and black-backed jackal. They are opportunistic omnivores found across Africa, Asia, and southeastern Europe. Golden jackals have expanded their range into Europe in recent decades.

Jabiru

The jabiru (Jabiru mycteria) is a large stork found in wetlands from Mexico to Argentina. It stands up to 1.4 meters tall with a wingspan of up to 2.6 meters. The black head and neck with a red throat patch are distinctive field marks.

Japanese Crane

The Japanese crane (Grus japonensis), also called the red-crowned crane, is one of the largest crane species. It breeds in eastern Russia and China, with a non-migratory population in Hokkaido, Japan. The species is listed as Endangered, with an estimated population of 2,000 to 3,000 individuals.

Practical Assessment Steps for Species Identification

When identifying J-named animals in the field or in photographs, follow these systematic steps to ensure accurate identification.

Step 1: Record Geographic Location

Note the country, region, and habitat type where the animal was observed. Geographic range is often the most reliable first filter for identification. For example, a large cat with rosettes in South America is a jaguar, while the same description in Africa indicates a leopard.

Step 2: Document Physical Characteristics

Record body size, coloration, distinctive markings, ear length, tail characteristics, and any unusual features. Take photographs from multiple angles when possible. Note whether the animal has fur, feathers, scales, or a gelatinous body.

Step 3: Observe Behavior

Note locomotion style, activity patterns, social grouping, and feeding behavior. A small rodent hopping bipedally in a desert is likely a jerboa. A primate bathing in a hot spring in Japan is a Japanese macaque.

Step 4: Consult Field Guides and Databases

Compare observations with field guides specific to the geographic region. Use reputable online databases such as the IUCN Red List and the National Center for Biotechnology Information for taxonomic and distribution information.

Step 5: Record and Report

Document the observation with date, time, location coordinates, and photographs. For rare or endangered species such as the Javan rhinoceros, report sightings to local conservation authorities immediately.

Records and Measurements for Research and Management

For researchers and wildlife managers working with J-named animals, maintaining accurate records is essential for population monitoring and conservation planning.

Population Monitoring Records

Record population counts, age structure, sex ratios, and reproductive success. For endangered species like the Javan rhinoceros, individual identification through camera trap images and fecal DNA analysis allows for detailed population tracking.

Behavioral Observation Records

Document feeding behavior, social interactions, activity patterns, and habitat use. For Japanese macaques, records of cultural behaviors such as food washing and hot spring bathing provide insights into social learning and tradition.

Health and Disease Records

Record signs of illness, injury, and mortality. For livestock producers, monitoring for diseases such as trypanosomosis in cattle and sheep is important for herd health management. Research from Nigeria documented infection rates of 11.7 percent in cattle and 17.9 percent in sheep, with peak infections occurring from September to December.

Habitat Assessment Records

Document vegetation composition, water availability, and signs of habitat degradation. For jerboa populations, monitoring burrow density and distribution provides an index of population status.

Common Failure Patterns in Species Management

Several recurring problems affect the management and conservation of J-named animals. Recognizing these patterns helps professionals avoid common mistakes.

Habitat Fragmentation

Isolation of populations through habitat fragmentation reduces genetic diversity and increases extinction risk. The Javan rhinoceros exemplifies this problem, with the entire species confined to a single protected area. Maintaining habitat connectivity through corridors is essential for long-term viability.

Human-Wildlife Conflict

Jaguars preying on livestock and Japanese macaques raiding crops create conflict with local communities. Effective management requires addressing both wildlife conservation and livelihood concerns. Compensation programs, improved livestock husbandry, and non-lethal deterrents can reduce conflict.

Incomplete Population Data

Many J-named animals lack comprehensive population data. Several jerboa species are listed as Data Deficient, limiting conservation planning. Investing in survey efforts and monitoring programs is necessary to fill knowledge gaps.

Climate Change Impacts

Changing temperature and precipitation patterns affect habitat suitability and food availability. Desert species like jerboas may face reduced habitat as arid regions expand. Northern species like the Japanese macaque may experience range shifts as temperatures warm.

Welfare and Safety Considerations

Working with or observing J-named animals requires attention to both animal welfare and human safety.

Large Carnivore Safety

When working in jaguar habitat, follow established safety protocols. Avoid hiking alone, make noise to alert animals of your presence, and carry appropriate deterrents. Never approach a jaguar or its kill. If you encounter a jaguar, maintain eye contact, back away slowly, and do not run.

Venomous Marine Life Safety

Jellyfish stings range from mild to life-threatening. In areas with dangerous species such as box jellyfish, wear protective clothing when swimming. Learn the appropriate first aid for local species. Seek immediate medical attention for severe stings, difficulty breathing, or signs of anaphylaxis.

Primate Disease Transmission

Japanese macaques can transmit diseases to humans and vice versa. Maintain appropriate distance when observing wild macaques. Do not feed macaques, as this encourages close contact and disease transmission. In research settings, follow institutional biosafety protocols.

Endangered Species Handling

For critically endangered species like the Javan rhinoceros, minimize disturbance. Only authorized personnel should approach these animals. All handling requires permits and adherence to strict protocols to prevent injury or stress.

Professional Escalation Criteria

Recognize when to seek expert assistance in managing or studying J-named animals.

Veterinary Consultation

Consult a veterinarian when an animal shows signs of illness, injury, or abnormal behavior. For livestock, unexplained weight loss, fever, or reduced production may indicate disease requiring professional diagnosis. Blood testing and parasitological examination are important diagnostic tools.

Conservation Authority Notification

Report sightings of critically endangered species to relevant conservation authorities. For Javan rhinoceros, any sighting outside Ujung Kulon National Park requires immediate notification. For jaguars in the northern range, report sightings to state wildlife agencies.

Wildlife Conflict Resolution

When human-wildlife conflict escalates, contact professional wildlife management agencies. Attempting to relocate or kill problem animals without authorization is illegal in most jurisdictions and may worsen the situation.

Research Ethics Review

Before conducting research involving live animals, obtain approval from institutional animal care and use committees. Research must comply with applicable laws and ethical standards for animal welfare.

Frequently Asked Questions

What is the largest animal that starts with J?

The Javan rhinoceros is the largest land animal with a common English name starting with J. Adult males can weigh up to 2,300 kilograms. The jaguar is the largest cat species in the Americas but is considerably smaller than the Javan rhinoceros.

Are jackrabbits actually rabbits?

Jackrabbits are hares, not rabbits. They belong to the genus Lepus and differ from rabbits in several ways. Hares are born fully furred with open eyes, while rabbits are born hairless and blind. Jackrabbits also have longer ears and legs and do not dig burrows, instead resting in shallow depressions called forms.

Where can I see Japanese macaques in the wild?

Japanese macaques are found throughout Japan. The most famous location is Jigokudani Monkey Park in Nagano Prefecture, where macaques bathe in hot springs during winter. Other accessible locations include the Koshima Islands and various national parks across the country.

How many Javan rhinos are left in the world?

Fewer than 80 Javan rhinos remain, all in Ujung Kulon National Park in Indonesia. The population in Vietnam is presumed extinct, with the last confirmed sighting in 2010. The species is critically endangered and faces significant conservation challenges.

What do jerboas eat?

Jerboas are omnivorous, feeding on seeds, plant material, and insects. Their diet varies seasonally based on food availability. They obtain water from their food through metabolic processes and do not need to drink free water.

Are jellyfish dangerous to humans?

Some jellyfish species are dangerous to humans, while others cause only mild irritation. The box jellyfish found in Australian and Indo-Pacific waters is among the most venomous animals in the world. Always learn about local jellyfish species and appropriate first aid before swimming in unfamiliar waters.

What is the difference between a jaguar and a leopard?

Jaguars and leopards are different species from different continents. Jaguars live in the Americas, while leopards live in Africa and Asia. Jaguars are larger and more muscular, with rosettes that have spots in the center. Leopards have simpler rosettes without central spots. Jaguars also have a stronger bite force relative to body size.

How can I identify different junco species?

Juncos are identified by geographic location and plumage characteristics. The dark-eyed junco has several regional forms, including slate-colored, Oregon, pink-sided, gray-headed, and white-winged varieties. All have white outer tail feathers and pink bills. Consult regional field guides for detailed identification information.

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References and Further Reading

• NCBI Literature Resources. National Center for Biotechnology Information.
• PubMed. National Library of Medicine.
• Trop2 immunoPET/CT in clinical practice: facts and challenges.. 2026.
• Memory for a dinosaur exhibit: retrieval-based practice vs. restudy.. 2026.
• The allostery principle supports the symbolic character of signaling circuits: gene regulation provides a form of intelligence to living systems.. 2026.
• Rickettsia massiliae and its public health significance across Palearctic and Oriental regions: a scoping review.. 2026.
• Ideology in the Name of Science: Substituting Cultural Beliefs for Scientific Facts - A Critique of Quintana and Barrientos.. 2026.
• Effect of interstitial low level laser therapy on tibial defect. SPIE BiOS, 2016.
• Evaluation of sorghum (Sorghum bicolor) as replacent for maize in the diet of growing rabbits (Oryctolagus cuniculus). 2002.
• Prevalence And Distribution Of Ruminant Trypanosomosis In Bokkos Local Government Area Of Plateau State, Nigeria. 2004.
• Correction: Innovation below the surface: development of a canine underwater search training device for submerged scent detection (Frontiers in Veterinary Science, (2026), 12, (1653518), 10.3389/fvets.2025.1653518). Frontiers in Veterinary Science, 2026.

This article is educational and does not replace institutional policy, professional advice, or applicable safety and regulatory requirements.