Short-tailed opossums are growing in popularity as an exotic pet. They are small, generally friendly creatures which have good pet potential. They are certainly cute enough!
Short-tailed opossums (Monodelphis domestica) are from South America and are 4-6 inches long (body only; their tail is almost as long as the body) with thick grey-brown fur. The tail is prehensile, meaning it can wrap around and hold onto things, and hairless. They are marsupials, although they do not have a pouch like most marsupials. However, their young are born quite premature and helpless, latch on to a nipple on their mother's abdomen, and stay there until they are further developed, like other marsupials. In the wild, they will eat insects, spiders, and rodents. For this reason, they are actually welcome house guests in their native countries. They are easily handled if tame from a young age but should be kept as solitary pets because of their tendency to fight with other opossums. They are nocturnal so will be most active at night, although if they do awake they will be social during the day.
Short-tailed opossums are adept at escaping, so whatever enclosure is provided should be thoroughly escape-proof. An aquarium (15-20 gallon) with a tight fitting lid, or a narrow-mesh wire cage should work well. The ambient temperature should be kept at 70 - 80 F. Bedding should be provided - corn cob litter or shavings (not cedar!) will work well. A nest box is also required (commercial woven nest, or a margarine tub etc.), and tissue or shredded paper (not newspaper) will be appreciated as nesting material. Branches for perching and climbing are needed - make sure they are non-toxic and not treated with pesticides (parrot climbing toys and ladders also work well). In addition, a hamster wheel can be used to provide an opportunity for exercise. Short-tailed opossums are fairly tidy creatures and will usually pick a corner are area to use as a potty, so a litter pan can be placed here to make cage cleaning easier.
This is still a new area for short tails and owners and breeders tend to feed a wide variety of things. It is possible now to get commercially manufactured short tail food (e.g. Brisky's Short Tailed Opossum Food, available online). Otherwise, a commercial insectivore diet probably provides the best basic diet, although some feed cat food, ferret food, and a variety of other pelleted diets with success. Look for diets that are high in protein and low in fat. A variety of treats should be offered, including mealworms, crickets, fresh fruit and vegetables (offer a variety), and a hard-boiled egg. Feeding is best done at night, with items such as egg or chicken that will spoil removed after a short time. Occasional treats can include small amounts of cooked chicken and low-fat yogurt. Using a general vitamin/mineral supplement is probably a good idea as well. Water is very important to short tails and they can dehydrate very quickly, so it is vitally important to make sure their water bottle is always accessible and filled with fresh water.
As mentioned above, short-tailed opossums are best kept as solitary animals. A tame, often-handled young opossum will make the best pet. Males and females have equal pet potential. They do tend to be very friendly and inquisitive when tame and will be an enjoyable and entertaining pet.