Opossum Care Guide: Housing, Diet & Health Essentials

Opossum Basic Necessities: A Comprehensive Care Guide

Caring for an opossum requires a thorough understanding of their environmental, dietary, and behavioral needs. This guide covers the core basic necessities to ensure opossum well-being whether you are a wildlife rehabilitator or a dedicated pet caretaker. Learn about the proper habitat, nutrition, hygiene, socialization, enrichment, and health considerations essential to opossum care.

Housing and Habitat Requirements

The opossum’s environment should mimic their natural habitat as closely as possible. Proper housing is vital to their physical and psychological health, impacting everything from behavior to susceptibility to illness.

Indoor Caging

• Size: An indoor cage for juvenile or recovering opossums should provide ample space—typically a minimum of 3 feet wide, 2 feet deep, and 3 feet high per animal. Larger is always better for adult or growing opossums.
• Structure: Use wire mesh with openings no larger than 1/2 inch to prevent escapes. The cage should have a solid, secure lock.
• Bedding: Opt for untreated paper bedding, shredded newspaper, fleece, or clean towels. Avoid cedar, pine chips, or other aromatic woods, which are toxic.
• Enrichment: Add climbing branches, platforms, ropes, and tubes for activity. Offer several hiding places with boxes or bags made of natural materials.

Outdoor Enclosures

• Size: Minimum recommended outdoor release cage size is 4’x4’x8′ for each opossum, but larger (such as 8’x8’x8′) is preferred for final soft-release enclosures.
• Materials: Construct cages from 1/2-inch wire mesh. Floors, ramps, and platforms must have secure, solid footing—never bare mesh alone.
• Shelter and Placement: Place the cage in a shaded area with some filtered sunlight. Use a solid roof to protect from rain and sun. Add plenty of branches for climbing, and nest boxes positioned high up with ramps for access.
• Bedding: Line nest boxes with leaves or straw. Avoid hay, cedar shavings, and other potentially harmful bedding. Collect natural nesting materials where possible.
• Release Preparation: Keep opossums in outdoor release enclosures for at least 3 weeks prior to returning to the wild. Only release animals that reach a minimum weight of 2.5-3.0 lbs, display natural behaviors, and exhibit foraging skills.

Diet and Nutrition

Opossums possess unique dietary needs. Their health hinges on the correct balance of nutrients, particularly calcium and phosphorous. Wild opossums are omnivorous, eating a varied diet that includes insects, fruits, small animals, eggs, and carrion. In captivity, providing balanced nutrition is paramount.

Baby Opossum Feeding

• Formula: Use a species-appropriate or veterinarian-recommended formula such as diluted Goat’s Milk Esbilac (1 part formula to 3 parts water).
• Feeding Tools: For infants unable to lap, use a pet nursers, syringes, or eyedroppers. Use separate utensils for sick or quarantined animals.
• Feeding Frequency: Feed at least 6 times per day, decreasing as the animal matures and starts eating solid foods. Ensure all babies are fed, as some may be less assertive at feeding time.
• Stimulating Elimination: After feeding, stimulate the urogenital area with a soft, damp cloth to encourage urination and defecation until the opossum urinates independently (typically when they begin lapping on their own).

Transition to Solids

• Start introducing soft foods as soon as the lapping reflex develops. Begin with rice cereal mixed with formula to make a gruel.
• Add mashed fruits like banana or apple, then moistened dry puppy food, and finally a mix of vegetables as teeth emerge.
• Gradually decrease liquid in the food as solids are accepted. Continue to monitor their willingness to take new foods closely.

Adult Opossum Diet

• No commercial diet is perfectly formulated for opossums. Strive for a calcium to phosphorus (Ca:P) ratio of 1.5:1 in all meals.
• Recommended ingredients for a balanced adult diet:
  • High-quality kitten or puppy food (as a base).
  • Cooked eggs with shell, low-fat yogurt, mealworms, insects, and some lean poultry.
  • Fresh fruits (berries, bananas, apples, papaya, melon).
  • Fresh vegetables (sweet potatoes, carrots, leafy greens).
  • Some whole foods like feeder mice, crickets, or smelt for enrichment and natural calcium/phosphorous sources.
• Avoid processed human foods, chocolate, dairy (except plain yogurt), onions, garlic, grapes, or raisins.
• Always provide fresh water (in spill-proof dishes or bottles to avoid drowning risk for young animals).

Health and Hygiene

Maintaining the cleanliness of the opossum’s environment is crucial. Sanitation, clean water, routine checks, and parasite control all play vital roles in their health.

Cleaning Cages

• Use chlorhexidine solution or Simple Green diluted in water as a safe cleaner. Alternatively, white vinegar and water makes an effective natural disinfectant.
• For deep cleaning, a diluted bleach solution (1:32 bleach to water) can be used. Always rinse thoroughly with water and allow the cage to dry in sunlight before returning animals.
• Remove soiled bedding and leftover food daily. Spot clean as needed, and perform a full cage sanitation weekly or more often if required.

Potty Training and Litter Pans

• Lapping babies (over 45g): Can be litter-trained using a shallow, stable dish as a potty pan. Ceramic and glass are ideal materials.
• Benefits: Makes daily clean-up easier and helps maintain good sanitation as they often continue this practice after release.
• Vinegar Tip: Add apple cider vinegar to the potty water. This keeps bacteria and mosquito larvae at bay, and can act as a mild probiotic if ingested.

Parasite Control

• Keep cages immaculately clean to minimize exposure.
• Use a clip-on fan near the food to deter flies and bugs.
• Sprinkle food-grade diatomaceous earth around the cage base for crawling parasites.
• Use vinegar solution in potty pans to deter mosquitos.
• Treat animals and cages appropriately for fleas before, during, and after being outdoors.
• Prevent ants by placing food dishes in a shallow bowl of water—the moat method—to block access.
• Never use commercial bug sprays on or near opossums or their enclosures.

Environmental Enrichment

To keep opossums engaged and promote natural behaviors, provide environmental and dietary enrichment both indoors and outdoors.

• Rotate toys, climbing branches, and nest box locations daily to reduce boredom and encourage exploration.
• Introduce new objects frequently: cardboard tubes, tunnels, or small boxes for foraging.
• Enrichment Foods: Offer diverse live food sources like mealworms, feeder mice, crickets, and whole eggs, plus seasonal fruits and vegetables.
• Hang food from branches or hide it throughout the cage to encourage natural foraging behaviors.
• Allow supervised outdoor foraging sessions in safe, predator-free environments whenever possible.

Temperature, Lighting, and Humidity

Always monitor ambient conditions carefully. Avoid exposing opossums to temperature extremes or drafts.

Daily Routine for Opossum Care

• Observe each animal for signs of illness, injury, or behavioral changes.
• Provide clean water and appropriate food portions daily, adjusting for age and condition.
• Spot clean habitat as needed; perform full cage cleaning weekly.
• Check for external parasites and manage environmental risks daily.
• Document temperature and humidity in indoor enclosures and adjust as necessary.
• Offer enrichment and foraging opportunities throughout the day and night.

Frequently Asked Questions (FAQ)

Q: Are opossums good pets?

A: Opossums are wildlife, and while they may be cared for during rehabilitation or exceptionally as educational animals, they generally do not make suitable household pets due to their specific environmental and nutritional requirements and their need for specialized veterinary care.

Q: What should I do if I find a baby opossum?

A: If the opossum is injured, underweight, or cold, contact a licensed wildlife rehabilitator immediately. In the interim, keep the baby warm, avoid feeding cow’s milk, and minimize handling.

Q: How often do opossums need to eat?

A: Very young opossums require feeding every few hours (up to 6 times per day), while older juveniles can be fed 2-3 times per day. Adults eat once daily, typically in the evening to mimic their nocturnal feeding habits.

Q: Can opossums be litter trained?

A: Yes. Opossums weighing over 45 grams can usually learn to use a potty pan. This practice often continues after release and assists with cleanliness in captivity.

Q: What are signs of an unwell opossum?

A: Lethargy, weight loss, rough coat, abnormal droppings, lack of appetite, or abnormal behaviors are concerning signs. Immediate veterinary assessment is recommended for sick or injured animals.

Conclusion

Caring for opossums involves much more than simply providing shelter and food. Their specialized needs regarding housing, diet, hygiene, enrichment, and healthcare must all be met for them to thrive, whether temporarily in rehabilitation or permanently in a sanctuary or educational setting. Always seek advice from wildlife professionals and licensed veterinarians experienced with opossums, and strive to support these unique creatures with the dedication and knowledge they deserve.