How Animals Help Ecosystems: The Roles They Play

Animals are not passive occupants of their environments. They shape the ecosystems they inhabit through feeding, movement, excretion, nesting, and even death. These activities generate measurable benefits for plants, soils, water bodies, and human communities. This article explains the main ways animals contribute to ecosystem health, with attention to pollination, seed dispersal, nutrient cycling, pest control, and habitat modification. It also covers ecosystem engineer species and the specific services provided by dung beetles, birds, bats, wasps, and waterbirds. The content is written for students, researchers, life-science professionals, and informed general readers who want a practical understanding of how animal behavior translates into ecosystem function.

At a Glance: Animal Ecosystem Services and Their Functions

The table below summarizes the primary ecosystem services provided by different animal groups, the mechanisms involved, and examples of the organisms that perform them.

Defining Ecosystem Services Provided by Animals

Ecosystem services are the benefits that people obtain from natural processes. The United Nations Millennium Ecosystem Assessment recognizes four categories of services: provisioning, regulating, cultural, and supporting. Animals contribute to all four categories, although the supporting services often receive less attention because their economic value is harder to measure.

Birds, for example, contribute to all four types of services recognized by the Millennium Ecosystem Assessment. They act as predators, pollinators, scavengers, seed dispersers, seed predators, and ecosystem engineers. These services arise in two ways: through behavior, such as the consumption of agricultural pests, and through bird products, such as nests and guano. Because most birds can fly, they respond to pulsed or irruptive resources in ways that ground-dwelling vertebrates generally cannot. Migratory bird species link ecosystem processes across great distances, connecting nutrient cycles and food webs that would otherwise remain separate.

Bats provide similar services. They have long been recognized as important agents of arthropod suppression, seed dispersal, and pollination, although rigorous evaluation of these services has only recently begun. Insectivorous bats consume large quantities of night-flying insects, many of which are agricultural pests. Frugivorous bats disperse seeds over long distances, and nectarivorous bats pollinate flowers that open at night. The economic value of these services is substantial, but few studies have quantified it fully.

Aculeate wasps, which include the stinging wasps, perform services that are often overlooked. They act as parasites, predators, biological indicators, pollinators, decomposers, and seed dispersers. Their role in natural pest management and biological control programs offers economic benefits that rival those of bees, yet public perception of wasps as pests has limited research attention and conservation support.

Pollination Services

Pollination is the transfer of pollen from the male structures of a flower to the female structures, enabling fertilization and seed production. Animals perform this service when they visit flowers for nectar, pollen, or other resources. Bees are the most widely recognized pollinators, but bats, birds, wasps, and other insects also contribute.

Bat Pollination

Nectarivorous bats visit flowers that open at night, often in tropical and subtropical regions. These flowers tend to be large, pale, and strongly scented, adaptations that attract bats. As bats feed on nectar, pollen adheres to their fur and is transferred to other flowers. This service is essential for the reproduction of many plant species, including some that produce commercially valuable fruits.

Research on bat ecosystem services has documented their dietary preferences, foraging behaviors, and adaptations in the context of pollination. The consequences of these interactions extend to both natural and agricultural systems, although the full economic value remains to be determined.

Bird Pollination

Birds that visit flowers for nectar, such as hummingbirds, sunbirds, and honeyeaters, also transfer pollen between plants. Bird-pollinated flowers are often tubular, brightly colored, and produce large volumes of nectar. The birds' ability to fly long distances allows them to connect plant populations that are spatially separated, supporting gene flow and genetic diversity.

Wasp Pollination

Aculeate wasps are less well known as pollinators than bees, but they do visit flowers for nectar. Some wasp species are specialized pollinators of particular plants, such as figs. The review of aculeate wasp ecosystem services identifies pollination as one of their four main service categories, alongside regulatory, provisioning, and cultural services.

Seed Dispersal Services

Seed dispersal is the movement of seeds away from the parent plant. Animals disperse seeds through several mechanisms: ingestion followed by defecation, attachment to fur or feathers, and caching for later consumption. This service is critical for plant population dynamics, forest regeneration, and the maintenance of genetic diversity.

Frugivorous Bats and Birds

Frugivorous bats and birds consume fruits and pass the seeds in their feces. Because these animals can fly, they transport seeds over distances that ground-dwelling dispersers cannot match. This movement allows plants to colonize new areas, escape density-dependent mortality near the parent plant, and track suitable habitat conditions as they shift.

Migratory birds are particularly important seed dispersers because they link ecosystems separated by large distances. The seeds they carry can establish new plant populations in distant locations, contributing to the resilience of plant communities.

Waterbirds as Seed Vectors

Waterbirds play key functional roles in aquatic ecosystems as vectors of seeds, invertebrates, and nutrients. They move between wetlands, lakes, and coastal areas, transporting seeds in their digestive tracts or attached to their bodies and feathers. This movement connects aquatic plant populations across the landscape and supports the diversity of wetland vegetation.

The review of waterbird ecosystem services identifies seed dispersal as one of their key functional roles. Waterbirds also maintain the diversity of other organisms, control pests, act as bioindicators of ecological conditions, and serve as sentinels of potential disease outbreaks.

Nutrient Cycling and Energy Transfer

Nutrient cycling is the movement of elements such as nitrogen, phosphorus, and carbon through ecosystems. Animals contribute to this process by consuming organic matter, digesting it, and excreting nutrients in forms that plants can use. They also transport nutrients across ecosystem boundaries, connecting food webs that would otherwise remain separate.

Dung Beetle Ecosystem Services

Dung beetles are among the most important contributors to nutrient cycling in terrestrial ecosystems. They feed on feces, burying portions of it in the soil for their larvae. This activity serves several functions: it removes waste from the surface, reduces breeding sites for flies and parasites, and incorporates organic matter and nutrients into the soil.

The burial of dung improves soil structure and fertility, enhances water infiltration, and promotes plant growth. Dung beetles also reduce the population of pest flies that breed in manure, providing indirect benefits to livestock operations. These services are particularly valuable in pasture systems where cattle and other livestock produce large volumes of dung.

Waterbirds as Nutrient Vectors

Waterbirds concentrate nutrients in their guano, which is deposited at roosting and nesting sites. This input can be substantial, particularly at colonies where large numbers of birds gather. The nutrients support primary production in aquatic systems, but excessive inputs can also lead to eutrophication and water quality problems.

Research on waterbird-mediated energy transport in soda pan ecosystems has quantified the scale of this service. Using long-term census data from two internationally important wetland sites in Central Europe, researchers estimated that waterbird guilds function as net importers, importer-exporters, or net exporters of energy. Net energy import ranged from 574,712 to 57,022,011 kJ per hectare per year, while net energy export ranged from 361,206 to 16,171,538 kJ per hectare per year. The average community-level energy balance was significantly positive, meaning that waterbirds imported more energy than they exported. This functional asymmetry ensures that energy import remains dominant over export regardless of species richness, defining the ecosystem's role as a significant energy sink.

Decomposition by Insects

Insects are the most abundant and diverse organisms on Earth and provide essential ecosystem services, including decomposition. Decomposer insects break down dead plant and animal material, releasing nutrients that plants can use. This process is fundamental to nutrient cycling in both natural and agricultural ecosystems.

A review of ecosystem services provided by insects in Brazil found that decomposition was among the most frequently studied services, along with pollination and biological control of pests. The studies focused primarily on natural and anthropic ecosystems, and most followed an experimental approach. The review noted that information on insect ecosystem services was mostly taxon-biased, with certain groups receiving more research attention than others.

Pest Control Services

Animals regulate pest populations through predation, parasitism, and competition. This service is economically valuable because it reduces crop damage and limits the need for chemical pesticides.

Birds as Pest Predators

Birds consume agricultural pests as part of their diet. Insectivorous birds feed on caterpillars, beetles, grasshoppers, and other invertebrates that damage crops. Because birds can fly, they can respond quickly to pest outbreaks, moving into areas where prey is abundant.

The review of bird ecosystem services identifies pest consumption as a key behavioral service. Birds also act as scavengers, removing carrion that would otherwise attract pests and disease vectors.

Bats as Arthropod Suppressors

Insectivorous bats consume large quantities of night-flying insects, including many agricultural pests. A single bat can consume thousands of insects in a night, and colonies of bats can suppress pest populations across substantial areas. This service is particularly valuable in agricultural landscapes where pests cause significant economic losses.

Research on bat ecosystem services has documented their dietary preferences and foraging behaviors in the context of arthropod suppression. The economic value of this service has been estimated in some regions, but comprehensive valuation remains incomplete.

Aculeate Wasps in Biological Control

Aculeate wasps are important natural enemies of many pest insects. Solitary wasps hunt prey to provision their nests, and social wasps feed insects to their larvae. This predation suppresses pest populations and contributes to biological control programs.

The review of aculeate wasp ecosystem services highlights their substantial but largely overlooked economic benefits through natural pest management. The authors argue that the ecosystem service value of aculeate wasps should be considered on par with that of bees and other useful insects.

Entomopathogenic Fungi and Pest Regulation

Entomopathogenic ascomycetes are fungi that infect and kill arthropods. They are an important part of the microbiota in most terrestrial ecosystems, regulating natural populations of arthropod pests in both surface and underground habitats. These fungi also establish unique relationships with plants, offering direct benefits to agriculture and human welfare.

A systematic review of ecosystem services provided by entomopathogenic ascomycetes identified several functions: direct and indirect pest biocontrol, plant growth promotion, plant defense against biotic and abiotic stresses, nutrient cycling, and the production of new bioactive compounds with agricultural, pharmaceutical, and medical importance. These fungi are compatible with the ecosystem services provided by other microbial and macrobial biocontrol agents.

Habitat Modification and Ecosystem Engineering

Ecosystem engineers are species that modify the physical environment, creating habitats used by other organisms. Their activities can alter water flow, soil structure, vegetation patterns, and the availability of resources for other species.

Examples of Ecosystem Engineers

Beavers are classic ecosystem engineers. They build dams that create ponds and wetlands, altering water flow and creating habitat for fish, amphibians, waterbirds, and invertebrates. The ponds also trap sediment and nutrients, improving water quality downstream.

Woodpeckers create cavities in trees that are later used by other birds, mammals, and insects. These cavities provide nesting sites and shelter for species that cannot excavate their own holes.

Large herbivores, such as elephants and bison, modify vegetation structure through grazing and browsing. They create open areas within forests and grasslands, which support different plant and animal communities than undisturbed areas.

Waterbirds as Ecosystem Engineers

Waterbirds modify aquatic habitats through their feeding activities. Dabbling ducks disturb sediments while foraging, which can increase nutrient availability and affect the distribution of aquatic plants and invertebrates. Some waterbirds create nesting mounds or trample vegetation, altering the physical structure of wetlands.

The review of waterbird ecosystem services identifies their role as predators, herbivores, and vectors of seeds, invertebrates, and nutrients. These roles have often been overlooked, but they are important for maintaining the diversity of other organisms in aquatic ecosystems.

Practical Assessment of Animal Ecosystem Services

Farmers, land managers, and conservation professionals can assess the ecosystem services provided by animals on their land. The following steps provide a practical framework for observation and measurement.

Step 1: Identify the Animal Groups Present

Conduct a survey of the animals that use the land. Record the presence of birds, bats, insects, and mammals, noting which species are common and which are rare. Pay attention to the time of day and season, as different species are active at different times.

Step 2: Observe Feeding Behavior

Watch how animals interact with plants and other animals. Note which flowers are visited by pollinators, which fruits are consumed by seed dispersers, and which pest insects are eaten by predators. Record the timing and intensity of these activities.

Step 3: Measure Indicators of Ecosystem Services

Use simple measurements to track ecosystem services over time. For pollination, count the number of flowers that develop into fruits. For pest control, monitor pest populations before and after the arrival of predators. For nutrient cycling, measure soil organic matter or observe the rate at which dung disappears from pastures.

Step 4: Keep Records

Maintain a log of observations, including dates, weather conditions, and the abundance of different animal groups. This record will help identify patterns and changes over time.

Step 5: Adjust Management Practices

Use the observations to inform management decisions. For example, if pollinator activity is low, consider planting flowering plants that attract bees and other pollinators. If pest populations are high, evaluate whether natural predators are present and whether habitat improvements could support them.

Records and Measurements for Ecosystem Services

The table below summarizes the types of records and measurements that can be used to track animal ecosystem services.

Common Failure Patterns in Ecosystem Service Management

Several common problems can reduce the ecosystem services provided by animals. Recognizing these patterns helps managers take corrective action.

Loss of Habitat Diversity

Monocultures and simplified landscapes support fewer animal species. When hedgerows, wetlands, and wildflower strips are removed, pollinators, seed dispersers, and pest predators lose food and shelter. The result is a decline in ecosystem services.

Overuse of Pesticides

Broad-spectrum pesticides kill beneficial insects along with pests. This reduces pollination, pest control, and decomposition services. Integrated pest management approaches that minimize pesticide use help preserve these services.

Disruption of Migratory Pathways

Migratory birds and bats depend on stopover sites where they can rest and feed. When these sites are degraded or destroyed, migratory species may not complete their journeys, reducing the services they provide at their destinations.

Fragmentation of Natural Habitats

Fragmentation isolates animal populations and reduces their ability to move across the landscape. This limits seed dispersal, pollination, and nutrient transport, particularly for species that require large territories.

Limitations and Knowledge Gaps

The scientific understanding of animal ecosystem services is incomplete. Several limitations affect the ability to manage these services effectively.

Economic Valuation Is Incomplete

Few studies have estimated the economic value of ecosystem services provided by animals. The review of bat ecosystem services notes that few studies estimating economic value have been conducted to date. The review of bird ecosystem services similarly states that the economic value of most supporting services has yet to be quantified.

Research Is Taxon-Biased

Research on ecosystem services tends to focus on certain groups, such as bees and butterflies, while neglecting others. The review of aculeate wasp ecosystem services notes that the scope and nature of the services they provide are not well understood relative to other insect groups. The review of insect ecosystem services in Brazil found that information was mostly taxon-biased.

Behavioral Mechanisms Are Understudied

The importance of animal behavior for ecosystem services is an emerging area of research. The publication record for "The importance of animal behavior for ecosystem services" in Trends in Ecology and Evolution indicates that this topic is receiving attention, but the behavioral mechanisms underlying many services remain poorly characterized.

Ecosystem Complexity Limits Prediction

Ecosystems are complex, and the effects of animal activities can be difficult to predict. The interactions between species, environmental conditions, and management practices create outcomes that are not always straightforward.

Welfare and Safety Context

Managing animals for ecosystem services requires attention to animal welfare and human safety. Wild animals should not be captured, handled, or disturbed unnecessarily. Observing animals from a distance and providing habitat that supports their natural behaviors is the most appropriate approach.

Some animals that provide ecosystem services also pose risks. Bats can carry diseases, and wasps can sting. Waterbirds can act as sentinels of disease outbreaks, and their presence may indicate public health concerns. The review of waterbird ecosystem services identifies their role as sentinels of potential disease outbreaks, which is relevant for public health monitoring.

Ticks and other parasites can be associated with wild animals and livestock. A study of ticks in lagoon ecosystems in Mexico found that 93.7% of cattle were infested with ticks, while 50.9% of wild animals were infested. Eight tick species from three genera were identified, with greater species richness in wild animals than in cattle. This finding highlights the need to analyze the potential for tick exchange among hosts and to correlate tick diversity with pathogen prevalence.

Wild mammals can also serve as reservoirs for parasites that affect domestic animals and humans. A study of gastrointestinal helminths in brown bears in Türkiye detected Baylisascaris transfuga, Uncinaria stenocephala, and Dicrocoelium dendriticum in fecal samples and post-mortem examinations. The study suggests that bears may act as reservoirs for parasitic agents, playing an active role in the persistence of pathogens in the environment and their transmission to different hosts. These findings need to be examined from a One Health perspective, which focuses on biological transmission networks within ecosystems instead of on infection foci alone.

Professional Escalation Criteria

Certain situations warrant consultation with a professional. Consider seeking expert advice in the following circumstances:

• A sudden decline in pollinator activity or fruit set that cannot be explained by weather or management changes
• An outbreak of pests that persists despite the presence of natural predators
• Evidence of disease in wild animals that could affect livestock or humans
• The presence of ticks or parasites in unusual numbers or species
• Plans for land-use changes that could affect migratory pathways or critical habitats

Professionals who can provide guidance include extension agents, wildlife biologists, conservation ecologists, and veterinary professionals with expertise in wildlife health.

Frequently Asked Questions

What are ecosystem services provided by animals?

Ecosystem services are the benefits that people obtain from natural processes. Animals contribute to these services through pollination, seed dispersal, nutrient cycling, pest control, and habitat modification. These services fall into four categories recognized by the United Nations Millennium Ecosystem Assessment: provisioning, regulating, cultural, and supporting services.

What is an ecosystem engineer species?

An ecosystem engineer species is an animal that modifies the physical environment, creating habitats used by other organisms. Examples include beavers, which build dams that create ponds and wetlands, and woodpeckers, which create cavities in trees that are later used by other species. These modifications can alter water flow, soil structure, and vegetation patterns.

What ecosystem services do dung beetles provide?

Dung beetles feed on feces and bury portions of it in the soil for their larvae. This activity removes waste from the surface, reduces breeding sites for flies and parasites, and incorporates organic matter and nutrients into the soil. Dung beetle activity improves soil structure and fertility, enhances water infiltration, and promotes plant growth.

How do birds contribute to ecosystem services?

Birds contribute to all four types of ecosystem services recognized by the Millennium Ecosystem Assessment. They act as predators, pollinators, scavengers, seed dispersers, seed predators, and ecosystem engineers. Because most birds can fly, they can respond to pulsed resources and link ecosystem processes across great distances.

What ecosystem services do bats provide?

Bats provide ecosystem services through arthropod suppression, seed dispersal, and pollination. Insectivorous bats consume large quantities of night-flying insects, many of which are agricultural pests. Frugivorous bats disperse seeds over long distances, and nectarivorous bats pollinate flowers that open at night.

What ecosystem services do wasps provide?

Aculeate wasps perform important ecosystem services as parasites, predators, biological indicators, pollinators, decomposers, and seed dispersers. They offer substantial economic benefits through their roles in natural pest management and biological control programs. Their value is often overlooked because of their public reputation as pests.

How do waterbirds affect nutrient cycling?

Waterbirds act as vectors of seeds, invertebrates, and nutrients in aquatic ecosystems. They concentrate nutrients in their guano, which is deposited at roosting and nesting sites. Research in soda pan ecosystems has shown that waterbird guilds function as net importers of energy, with net energy import consistently exceeding net energy export.

Why is it important to study animal behavior for ecosystem services?

Animal behavior determines how ecosystem services are delivered. Foraging behavior affects pollination and pest control, movement patterns affect seed dispersal and nutrient transport, and habitat selection affects where services are provided. Understanding these behavioral mechanisms is essential for managing and conserving ecosystem services.

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References and Further Reading

• NCBI Literature Resources. National Center for Biotechnology Information.
• PubMed. National Library of Medicine.
• Ecosystem services of entomopathogenic ascomycetes.. Journal of invertebrate pathology, 2023.
• Ecology. Ecosystem services.. Science (New York, N.Y.), 2005.
• Ecosystem services provided by birds.. Annals of the New York Academy of Sciences, 2008.
• Ecosystem services provided by bats.. Annals of the New York Academy of Sciences, 2011.
• Marine ecosystem services.. Current biology : CB, 2017.
• Ecosystem services provided by aculeate wasps.. Biological reviews of the Cambridge Philosophical Society, 2021.
• Ecosystem services provided by waterbirds.. Biological reviews of the Cambridge Philosophical Society, 2014.
• Ecosystem Services Provided by Insects in Brazil: What Do We Really Know?. Neotropical entomology, 2020.
• Occurrence and behaviors of organophosphate esters in shallow grass-type lake ecosystems: The key role of aquatic plants.. 2026.
• Diversity and prevalence of ticks associated to cattle and wild animals in lagoon ecosystems of northern Veracruz, México.. 2026.
• Waterbird guilds function as dynamic cross-ecosystem energy vectors in unique soda pan model systems.. 2026.
• Gastrointestinal helminths in brown bears in Erzurum, Türkiye: Biological Bridge, Anthropogenic Threat. 2026.
• &lt,b&gt,More diverse than expected: A new troglobitic species of &lt,i&gt,Seborgia&lt,/i&gt, Bousfield, 1970 (Amphipoda: Seborgiidae) from caves of the Brazilian semiarid&lt,/b&gt,.. 2026.
• Executive functioning in wild guppies: investigating the impact of a pharmaceutical pollutant.. 2026.
• Microbial Resource Regimes Shape Early Survival, Growth, and Reproductive Morphology in a Phally Polymorphic Terrestrial Gastropod.. 2026.
• Animals and Ecosystem Services. Natural Resource Management and Policy, 2026.
• The importance of animal behavior for ecosystem services. Trends in Ecology and Evolution, 2023.
• Research on Ecosystem Service Supply, Demand and Ecological Resilience in the Context of Agriculture-Forestry-Animal Husbandry Composite System in Dibei Zagana, China. Polish Journal of Environmental Studies, 2024.

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