Building Bioactive Reptile Terrariums: Substrate Layers, Microfauna Clean-Up Crews, and Plant Selection
I know that feeling, you've brought home a beautiful reptile, set up a basic tank with paper towels and a water bowl, and now you're looking at that sterile enclosure thinking, "There has to be a better way." You're right. There is. A bioactive terrarium isn't just about making things look pretty; it's about creating a self-sustaining ecosystem that mimics your pet's natural habitat, reduces your cleaning workload, and provides profound enrichment for your reptile. The key takeaway? With the right substrate layers, a healthy clean-up crew of microfauna, and carefully chosen plants, you can build a living world that manages its own waste, regulates humidity, and keeps your reptile healthier and happier for years to come.
⚠️ Emergency: When to Abandon or Immediately Modify Your Bioactive Setup While bioactive setups are generally safe, certain situations require immediate intervention. Go to your exotic veterinarian or remove your reptile to a hospital enclosure NOW if:
- Your reptile shows signs of respiratory distress (open-mouth breathing, wheezing, bubbles from nose/mouth) after setup changes
- You observe your reptile eating substrate, isopods, or plants excessively (impaction risk)
- There is visible mold growing on your reptile's skin or in the water bowl
- Your reptile stops eating, becomes lethargic, or shows neurological signs (head tilt, circling) after introducing new plants or soil
- The enclosure develops a foul, rotting smell that persists after spot-cleaning (anaerobic decay)
- You find dead clean-up crew members in large numbers without obvious cause
- Your reptile has a sudden, unexplained weight loss or bloating
What You're Seeing and What It Likely Means
When you first set up a bioactive terrarium, you're essentially creating a miniature ecosystem. The process can feel overwhelming, you're layering rocks, mixing soils, introducing bugs, and planting live plants. You might see condensation on the glass, a bit of mold on the wood, or your clean-up crew scurrying around. Here's what's actually happening:
That condensation? It's a sign your humidity gradient is working. The mold? It's the first stage of decomposition, your microfauna will eat it. The isopods and springtails you see? They're your janitors, breaking down waste, shed skin, and dead plant matter into nutrients that feed your plants. The plants, in turn, filter the air, absorb excess nutrients, and provide hiding spots for your reptile.
The entire system relies on a biological cycle called the nitrogen cycle. Your reptile produces waste (urates and feces), which contains ammonia. In a sterile tank, that ammonia builds up and becomes toxic. In a bioactive setup, your clean-up crew breaks down the waste into smaller particles. Bacteria and fungi then convert the ammonia into nitrites, then nitrates, which plants absorb as fertilizer. The plants use these nutrients to grow, and they release oxygen and transpire water vapor, maintaining humidity. It's a closed-loop system that, when balanced, requires minimal intervention from you.
What You Can Safely Do Right Now
Before you start building, here's what you can do today to prepare:
Step 1: Plan Your Enclosure Size Your bioactive setup needs space. For most reptiles, a 40-gallon breeder tank (36" x 18" x 16") is the minimum for a successful bioactive system. Smaller tanks are harder to balance because temperature and humidity fluctuate more rapidly. Measure your space and choose an enclosure that allows for at least 4-6 inches of substrate depth for burrowing species, or 2-3 inches for arboreal setups.
Step 2: Gather Your Materials You'll need:
- A glass or PVC enclosure with a screen top (for ventilation)
- Drainage layer material (clay balls, lava rock, or coarse gravel)
- Barrier screen (fiberglass window screen or weed barrier fabric)
- Substrate components (coco coir, peat moss, tree fern fiber, sphagnum moss, leaf litter)
- Clean-up crew (isopods and springtails)
- Reptile-safe plants
- A digital thermometer/hygrometer
- A spray bottle or misting system
- UVB and heat lamps appropriate for your species
Step 3: Start Your Substrate Layers Begin with the drainage layer. This is critical, without it, water pools at the bottom, creating anaerobic conditions that rot roots and produce toxic gases. Use 1-2 inches of clay balls or lava rock. Cover this with a barrier screen to prevent soil from falling into the drainage layer. Then add your substrate mix.
Step 4: Establish Your Clean-Up Crew Order your isopods and springtails from a reputable breeder or pet store. You'll need at least 10-20 isopods and several hundred springtails for a 40-gallon tank. Introduce them to the substrate after the tank has been set up for a week (to allow initial bacterial colonization). Provide leaf litter and a moist hide for them.
Step 5: Add Plants and Hardscape Choose plants that match your reptile's humidity needs. For tropical species, pothos, bromeliads, and ferns work well. For arid species, consider snake plants or succulents. Place plants in the substrate, ensuring roots are covered. Add branches, cork bark, and leaf litter for climbing and hiding.
Step 6: Cycle the Enclosure Before adding your reptile, let the bioactive system establish for 4-6 weeks. During this time, mist the enclosure daily, provide leaf litter, and monitor humidity. You'll see a fungal bloom (white or green mold on wood), this is normal and will be eaten by your clean-up crew. After the bloom subsides and plants show new growth, the system is ready.
When to Call Your Veterinarian
While bioactive setups are generally safe, certain situations warrant a call to your exotic vet:
- Your reptile stops eating for more than 7-10 days after being introduced to the bioactive enclosure. This could indicate stress from improper temperature/humidity or ingestion of substrate.
- You notice your reptile passing undigested food or substrate in its stool. This could indicate impaction or gastrointestinal issues.
- Your reptile develops skin lesions, blisters, or scale rot. This can happen if humidity is too high or if the substrate stays wet.
- Your clean-up crew population crashes (you find many dead isopods/springtails). This could indicate a toxin in the substrate or a disease that could affect your reptile.
- Your reptile shows signs of dehydration (sunken eyes, wrinkled skin, sticky mucous membranes). This can happen if humidity is too low or if the water source is contaminated.
- You see your reptile actively eating large amounts of substrate or plants. While some substrate ingestion is normal, excessive eating can lead to impaction.
What Your Vet Will Do
If you bring your reptile in for a bioactive-related issue, here's what to expect:
Physical Examination: Your vet will perform a thorough exam, checking body condition, skin health, oral cavity, and palpating the abdomen for masses or impaction. They'll assess hydration status and look for signs of respiratory infection.
Diagnostic Tests:
- Fecal examination: To check for parasites or undigested substrate
- Radiographs (X-rays): To look for impaction, foreign bodies, or bone density issues
- Blood work: To assess organ function, hydration, and calcium levels
- Culture and sensitivity: If there's a skin infection, to identify the bacteria and appropriate antibiotics
Expected Costs:
- Office visit: $50–$150
- Fecal exam: $30–$60
- Radiographs: $100–$300
- Blood work: $100–$250
- Culture: $50–$150
- Total for a diagnostic workup: $200–$800
Treatment Options:
- For impaction: Warm water soaks, mineral oil (under vet guidance), or surgery in severe cases
- For dehydration: Fluid therapy (oral or subcutaneous)
- For skin infections: Topical or systemic antibiotics
- For nutritional deficiencies: Dietary adjustments and supplements
Common Causes, A Deeper Look
The Nitrogen and Waste Breakdown Cycle in a Closed Bioactive Ecosystem
Understanding the nitrogen cycle is the foundation of bioactive success. In a natural ecosystem, waste doesn't accumulate, it's recycled. Here's how it works in your terrarium:
Stage 1: Waste Production Your reptile produces feces and urates (the white, chalky part of reptile waste). These contain ammonia, urea, and undigested organic matter. In a sterile tank, ammonia builds up and becomes toxic at levels above 0.5 ppm.
Stage 2: Mechanical Breakdown Your clean-up crew, isopods and springtails, are detritivores. They physically break down waste, shed skin, and dead plant material into smaller particles. This increases surface area for microbial activity. Isopods (roly-polies) are particularly efficient at consuming feces, while springtails focus on fungal spores and microscopic organic matter.
Stage 3: Microbial Decomposition Bacteria and fungi colonize the substrate and break down the small particles further. Ammonia-oxidizing bacteria (Nitrosomonas) convert ammonia into nitrites. Then nitrite-oxidizing bacteria (Nitrobacter) convert nitrites into nitrates. Nitrates are much less toxic and are the primary form of nitrogen that plants can absorb.
Stage 4: Plant Uptake Your live plants absorb nitrates through their roots and use them to build proteins and nucleic acids. This removes nitrogen from the system, preventing buildup. Plants also transpire water, maintaining humidity, and release oxygen.
Stage 5: Nutrient Return When plants drop leaves or die, the clean-up crew and microbes break them down, returning nutrients to the soil. This creates a self-sustaining cycle that requires minimal fertilizer input.
Key Metrics to Monitor:
- Ammonia: Should be 0 ppm in a cycled system
- Nitrites: Should be 0 ppm
- Nitrates: Should be <20 ppm (higher levels indicate overfeeding or insufficient plants)
- pH: Should be 6.5–7.5 for most setups
Drainage Layers (Leca/Mesh) and Barrier Screens to Prevent Waterlogging
Waterlogging is the number one killer of bioactive setups. When water accumulates at the bottom of the enclosure, it creates anaerobic conditions, no oxygen. Anaerobic bacteria produce toxic compounds like hydrogen sulfide (rotten egg smell) and methane. These gases can harm your reptile's respiratory system and kill plant roots.
The Drainage Layer: The drainage layer sits at the bottom of the enclosure, typically 1-3 inches deep. Its purpose is to collect excess water and keep it away from the substrate above. Common materials include:
- Expanded clay pellets (Leca): Lightweight, porous, and excellent at wicking water. They're the gold standard for tropical setups.
- Lava rock: Heavier but very porous. Good for arid setups where you want less water retention.
- Coarse gravel or pebbles: Less porous but effective. Ensure they're clean and free of dust.
The Barrier Screen: Above the drainage layer, you need a barrier screen to prevent substrate from falling into the drainage layer. If soil mixes with the drainage layer, it can clog the system and create anaerobic pockets. Use:
- Fiberglass window screen: Durable and allows water to pass through.
- Weed barrier fabric: Thicker and more resistant to tearing.
- Plastic canvas: Rigid and easy to cut to size.
How to Install:
- Add 1-2 inches of drainage material to the bottom of the enclosure.
- Cut your barrier screen to fit the enclosure, leaving a 1-inch overlap on all sides.
- Place the screen over the drainage layer, tucking it against the walls.
- Add your substrate on top, at least 2-4 inches deep.
Water Management:
- For tropical setups: Mist heavily 1-2 times daily. The drainage layer should collect water, but the substrate should not be soggy.
- For arid setups: Mist lightly every few days. The drainage layer may remain dry.
- Use a "drain tube" (a PVC pipe inserted into the drainage layer) to siphon out excess water if needed.
Custom Bioactive Substrate Mixes: ABG Mix, Coco Coir, Tree Fern Fiber, and Leaf Litter
The substrate is the heart of your bioactive system. It provides physical support for plants, habitat for microfauna, and a medium for microbial activity. A good substrate mix balances water retention, aeration, and nutrient content.
The ABG Mix (Atlanta Botanical Garden Mix): This is the gold standard for tropical bioactive setups. It was developed by the Atlanta Botanical Garden for their dart frog exhibits. The classic recipe:
- 2 parts tree fern fiber
- 1 part peat moss
- 1 part sphagnum moss
- 1 part fine charcoal (horticultural grade)
- 1 part coarse sand or perlite
Why it works: Tree fern fiber provides structure and aeration. Peat moss retains moisture and lowers pH. Sphagnum moss adds water-holding capacity. Charcoal absorbs toxins and provides surface area for beneficial bacteria. Sand/perlite improves drainage.
Coco Coir: Coco coir (coconut husk fiber) is an excellent alternative to peat moss. It's more sustainable, has a neutral pH, and retains water well. However, it breaks down faster than peat and may need replacement after 1-2 years. Use it as a base for tropical or temperate setups.
Tree Fern Fiber: This is a natural, fibrous material from tree fern trunks. It's slow to decompose, provides excellent aeration, and has a rough texture that microfauna love. It's ideal for burrowing species like snakes and lizards.
Leaf Litter: Leaf litter is not just decoration, it's a critical component. It provides food for isopods and springtails, creates hiding spots for microfauna, and slowly releases nutrients as it decomposes. Use dried oak, magnolia, or beech leaves. Avoid leaves from toxic plants like oleander or yew.
Custom Mix Recipes:
Tropical Setup (for high-humidity species like crested geckos, dart frogs):
- 40% coco coir
- 30% tree fern fiber
- 20% sphagnum moss
- 10% horticultural charcoal
- Plus a generous layer of leaf litter on top
Temperate Setup (for species like corn snakes, garter snakes):
- 50% organic topsoil (no fertilizers)
- 30% play sand
- 20% coco coir
- Plus leaf litter and sphagnum moss in humid hides
Arid Setup (for species like bearded dragons, leopard geckos):
- 60% play sand
- 30% organic topsoil
- 10% decomposed granite
- Minimal leaf litter (use small amounts for microfauna)
Important: Never use potting soil with fertilizers, perlite, or vermiculite. These can be toxic to reptiles. Always use organic, chemical-free components.
Selecting and Seeding Clean-Up Crew Microfauna: Isopods and Springtails
Your clean-up crew is the engine of the bioactive system. Without them, waste accumulates, mold takes over, and the system fails. Two groups are essential: isopods and springtails.
Isopods (Rollie Pollies, Woodlice): Isopods are crustaceans, not insects. They're detritivores that consume feces, shed skin, dead plants, and even small amounts of mold. They also aerate the soil as they burrow.
Common Species:
- Porcellio scaber (Common rough woodlouse): Hardy, fast-breeding, good for most setups
- Armadillidium vulgare (Pill bug): Rolls into a ball when disturbed, prefers drier conditions
- Porcellionides pruinosus (Powdery blue isopod): Colorful, fast-breeding, good for tropical setups
- Cubaris species: More specialized, require higher humidity
How to Seed:
- Start with 10-20 isopods for a 40-gallon tank
- Provide a "moist hide" (a piece of cork bark or a plastic cup with damp sphagnum moss)
- Offer supplemental food: fish flakes, vegetable scraps, leaf litter
- Maintain humidity above 60% for most species
Springtails (Collembola): Springtails are tiny (1-2 mm) arthropods that feed on mold, fungi, and microscopic organic matter. They're essential for preventing fungal blooms and keeping the substrate healthy.
Common Species:
- Folsomia candida (Tropical springtail): Most common, thrives in high humidity
- Sinella curviseta (Temperate springtail): Tolerates lower humidity
How to Seed:
- Start with several hundred springtails (they're tiny)
- Sprinkle them onto moist substrate or leaf litter
- They'll reproduce rapidly in humid conditions
- You can culture them separately in a container with charcoal and water
Population Management:
- Healthy populations will ebb and flow with food availability
- If you see too many isopods, reduce feeding or add more leaf litter
- If populations crash, check for toxins, low humidity, or predation by your reptile
Choosing Reptile-Safe Live Plants: Pothos, Bromeliads, Ferns, and Succulents
Plants are the third pillar of the bioactive system. They absorb nitrates, provide humidity, create hiding spots, and improve air quality. But not all plants are safe for reptiles. Some are toxic, while others can't tolerate the conditions.
Safe Plant Categories:
Tropical Plants (for high-humidity setups):
- Pothos (Epipremnum aureum): The workhorse of bioactive setups. Tolerates low light, high humidity, and being chewed. Grows quickly and roots easily.
- Bromeliads (Neoregalia, Guzmania): Epiphytic plants that grow on branches or bark. Their central cups hold water, providing drinking spots for reptiles. They need bright, indirect light.
- Ferns (Nephrolepis, Davallia): Boston fern, rabbit's foot fern. Love humidity and shade. Provide excellent ground cover.
- Ficus pumila (Creeping fig): A vine that climbs walls and branches. Needs high humidity and moderate light.
- Peperomia: Small, compact plants that do well in terrariums. Many species available.
Temperate Plants (for moderate humidity setups):
- Snake plant (Sansevieria): Very hardy, tolerates low light and dry conditions. Safe for reptiles.
- Spider plant (Chlorophytum comosum): Tolerates a range of conditions. Produces "pups" that can be propagated.
- Dracaena: Some species work well, but avoid those with sharp leaf tips.
Arid Plants (for low-humidity setups):
- Succulents (Haworthia, Echeveria, Aloe): Need bright light and well-draining soil. Avoid overwatering.
- Jade plant (Crassula ovata): Tolerates dry conditions but needs bright light.
- Opuntia (Prickly pear cactus): Safe for desert species like bearded dragons. Remove spines if needed.
Plants to Avoid:
- Ivy (Hedera helix): Toxic to reptiles
- Philodendron: Can cause oral irritation
- Dieffenbachia (Dumb cane): Contains calcium oxalate crystals
- Oleander: Highly toxic
- Azalea: Toxic
- Any plant with milky sap (like some Euphorbias)
Planting Tips:
- Remove plants from their nursery pots and gently wash off all soil
- Plant directly into the bioactive substrate
- For epiphytic plants (bromeliads, orchids), attach them to branches with fishing line or plant-safe glue
- Provide adequate lighting: most plants need 8-12 hours of light daily
- Monitor for pests (aphids, mealybugs) and treat with insecticidal soap if needed
Fungal Blooms and Bio-Establishment Periods Before Introducing Reptiles
One of the most alarming things new bioactive keepers see is a fungal bloom, white, green, or gray mold covering wood, leaf litter, or substrate. This is normal and actually a good sign.
What's Happening: When you first set up a bioactive enclosure, you're introducing a massive amount of organic matter (substrate, leaf litter, wood) into a warm, humid environment. Fungi are nature's decomposers, and they immediately begin colonizing. This is the first stage of the bio-establishment period.
The Timeline:
- Week 1-2: You'll see white fuzzy mold on wood and leaf litter. This is saprophytic fungi, it's breaking down dead organic matter. Your springtails will start eating it.
- Week 3-4: The fungal bloom peaks. You may see green mold (Trichoderma) or black mold (Stachybotrys). Don't panic, these are also decomposers. Your isopods will start consuming them.
- Week 5-6: The bloom subsides as your clean-up crew population grows. The substrate develops a healthy, earthy smell. Plants show new growth.
- Week 6-8: The system is cycled. Ammonia and nitrite levels should be zero. You can now introduce your reptile.
What to Do During the Bloom:
- Increase ventilation: Open the screen top for a few hours daily to reduce humidity spikes
- Add more springtails: They're your primary mold fighters
- Remove any mold that's growing on your reptile's food or water dishes
- Don't use antifungal products: They'll kill your beneficial microbes and clean-up crew
- Be patient: The bloom will pass
When to Worry:
- If mold covers more than 50% of the enclosure surface
- If you see mold growing on your reptile (if already introduced)
- If the enclosure smells rotten or sour (anaerobic decay)
- If your clean-up crew is dying
Maintaining Humidity Gradients and Long-Term Soil Nutrient Replenishment
A bioactive system isn't set-it-and-forget-it. It requires ongoing maintenance to stay balanced.
Humidity Gradients: Different reptiles need different humidity levels, but even within a single enclosure, you should create a gradient. This allows your reptile to choose its preferred microclimate.
How to Create a Gradient:
- Wet side: Place the water dish, mist heavily, and use sphagnum moss here. Humidity should be 70-90%.
- Dry side: Place the heat lamp here, mist lightly. Humidity should be 40-60%.
- Basking spot: Directly under the heat lamp, humidity will be lower (30-40%).
Monitoring:
- Use two digital hygrometers (one on each side)
- For tropical species: Maintain 60-80% overall humidity
- For arid species: Maintain 30-50% overall humidity
- Mist more frequently in winter when indoor air is drier
Long-Term Soil Nutrient Replenishment: Over time, your substrate will break down and lose nutrients. Here's how to maintain it:
- Every 3-6 months: Add a thin layer of fresh leaf litter. This provides food for your clean-up crew and slowly releases nutrients.
- Every 6-12 months: Add a small amount of organic compost or worm castings (no more than 1/4 inch layer). Mix it into the top layer of substrate.
- Every 1-2 years: Replace the top 2-3 inches of substrate. Leave the bottom layers intact to preserve the microbial community.
- Spot-clean: Remove large pieces of feces or uneaten food that your clean-up crew can't handle.
Signs Your Substrate Needs Replenishment:
- Plants are yellowing or stunted
- Clean-up crew population is declining
- The substrate has a sour or ammonia smell
- Water pools on the surface instead of draining
Prevention: Long-Term Strategies
Building a bioactive terrarium is an investment, but with proper maintenance, it can last for years. Here's how to keep it thriving:
1. Start with the Right Enclosure Choose an enclosure that's large enough for your reptile and allows for proper ventilation. Glass tanks with screen tops work well for most species. PVC enclosures retain humidity better for tropical setups.
2. Quarantine New Plants and Microfauna Before adding anything to your bioactive system, quarantine it for 2-4 weeks. This prevents introducing pests, diseases, or toxins. Keep new plants in a separate container and monitor for pests. Keep new isopods in a culture container before adding them to the main tank.
3. Maintain a Consistent Schedule
- Daily: Check temperature and humidity, spot-clean, mist as needed
- Weekly: Remove any dead plants, add fresh leaf litter, check clean-up crew populations
- Monthly: Test water quality (ammonia, nitrites, nitrates), add supplemental food for microfauna
- Quarterly: Replace top layer of leaf litter, add compost or worm castings
- Annually: Replace top 2-3 inches of substrate
4. Have a Backup Plan Always have a hospital enclosure ready in case your bioactive system crashes. This should be a simple setup with paper towels, a water bowl, and a hide. You may need it if:
- Your clean-up crew dies off
- You need to treat your reptile for illness
- You're remodeling the bioactive setup
5. Educate Yourself Continuously Join online communities (Reddit's r/bioactive, Facebook groups) and read books on vivarium design. Every species has unique requirements, and what works for one may not work for another.
Frequently Asked Questions
1. Can I use garden soil from my backyard for a bioactive terrarium? No. Garden soil contains unknown pathogens, pesticides, fertilizers, and weed seeds that can harm your reptile. Always use sterilized, organic components from reputable sources. If you want to use natural soil, bake it at 200°F (93°C) for 30 minutes to sterilize it, but this also kills beneficial microbes. It's safer to buy pre-made mixes.
2. How long does it take for a bioactive terrarium to fully cycle before adding my reptile? Most bioactive systems take 4-8 weeks to fully cycle. You'll know it's ready when: ammonia and nitrite levels are zero, plants show new growth, the fungal bloom has subsided, and your clean-up crew is actively reproducing. Rushing this process can lead to toxic ammonia spikes that harm your reptile.
3. My isopods keep dying. What am I doing wrong? Common causes of isopod death include: low humidity (below 50%), lack of leaf litter for food, high temperatures (above 85°F/29°C), toxins in the substrate (fertilizers, pesticides), or predation by your reptile. Check your humidity and temperature, add more leaf litter, and ensure you're not using any chemicals. Also, some isopod species are more sensitive than others, try a hardier species like Porcellio scaber.
4. Can I use springtails alone without isopods? Springtails are excellent at controlling mold, but they can't handle larger waste like feces and shed skin. Isopods are needed for mechanical breakdown of larger organic matter. For a fully functional bioactive system, you need both. Springtails alone will lead to waste accumulation and ammonia buildup.
5. My reptile is eating the plants. Is this safe? It depends on the plant. Pothos, spider plants, and snake plants are generally safe if ingested in small amounts. However, some plants can cause gastrointestinal irritation or impaction. If your reptile is eating plants excessively, it may be hungry, bored, or lacking certain nutrients. Offer more appropriate food and provide enrichment items. Remove any plants that are being heavily consumed.
6. How do I clean a bioactive terrarium without destroying the ecosystem? Bioactive systems require minimal cleaning. Spot-clean large feces and uneaten food. Wipe down glass with water or a 50/50 vinegar solution (rinse thoroughly). Never use bleach, ammonia, or harsh chemicals. If you need to deep clean, remove your reptile and clean-up crew, then replace the top layer of substrate. Leave the bottom layers intact to preserve the microbial community.
7. Can I use a bioactive setup for a snake that eats rodents? Yes, but with precautions. Rodent waste is high in ammonia and can overwhelm a small clean-up crew. For snake enclosures, use a larger tank (40+ gallons), a robust clean-up crew (50+ isopods, thousands of springtails), and spot-clean rodent feces immediately. Some keepers use a separate feeding enclosure to reduce waste in the bioactive tank.
8. My bioactive terrarium smells bad. What's wrong? A healthy bioactive system should smell like damp earth, earthy and pleasant. A foul, rotten, or sour smell indicates anaerobic decay. This happens when the drainage layer is clogged, the substrate is too wet, or there's not enough ventilation. Check your drainage layer, reduce misting, increase ventilation, and remove any rotting organic matter. If the smell persists, you may need to rebuild the system.
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This guide was written by a senior veterinary clinician with expertise in exotic animal medicine. Always consult with a qualified exotic veterinarian for species-specific advice. Bioactive setups are not a substitute for proper veterinary care.