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Short Tailed Opossum

Family: Didelphidae Picture of "Kisak" and "Suki-da", two Short Tailed Opossums"Kisak" and "Suki-da"Monodelphis domesticaPhoto Animal-World: Courtesy Robin White
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I have a STO and he is great!! I have a question: he has started to lose his hair on his head in between his ears and a little on his butt. But he seems ok. eating... (more)  angie

   Not only is the exotic Short Tailed Opossum very small, but it has a curious and easy-going nature... they are becoming quite a popular "pocket pet"!

  Short Tailed Opossums, also referred to as STO's, are small and very cute. They make unique and fascinating pets. If handled at an early age they are easy to tame and become very friendly. They usually do not bite and are very easy to keep., you can even train them to use a litter box. They are solitary animals however, and should be kept singly as they tend to fight with other opossums when they reach maturity.

  Because of their nature and uniqueness, the Short Tailed Opossums make excellent pets. They are quiet, active, and inquisitive, and since opossums are not rodents they generally don't gnaw on things. A special bonus to keeping a Short Tailed Opossum, they will eat unwelcome pests such as insects and rodents. Because of this they are sometimes referred to as "House Opossums". They are generally nocturnal, getting active at dusk which is great for people who have the evening hours to interact with their pet. If they are awakened during the day though, they will venture out and be social.

   The Short Tailed Opossum belongs to the order marsupialia. Unlike many marsupials, the Short Tailed Opossum does not have a pouch. They have a unique adaptation in caring for their young. New born babies will latch onto a nipple on their mother's stomach which then enlarges and holds the babies securely in place.

   There are a variety of marsupials including such creatures as kangaroos, Sugar Gliders, Wombats, Ringtail Possums, and Tasmanian Devils.

For information about Small Animals and their care visit:
Guide to a Happy, Healthy Small Animal


Geographic Distribution
Monodelphis domestica
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Data provided by GBIF.org
  • Kingdom: Animalia
  • Phylum: Chordata
  • Class: Mammalia
  • Order: Didelphimorphia
  • Family: Didelphidae
  • Genus: Monodelphis
  • Species: domestica
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Scientific Name: Monodelphis domestica

Background:   The Short-Tail Opossum is found mainly in Brazil and adjoining countries of Bolivia, Paraguay, and Chile and there are 17 different species. The Monodelphis domestica, described here, was imported into the United States from Brazil in 1978 by the National Zoo and introduced into the pet market in 1994. Brazil has now closed their borders to exportation, so those available for pets are all bred in captivity.
  In their native countries they live close to humans and are frequently found living in houses. Natives call them "cachita" and consider them to be good luck. They readily welcome them as they have a great appetite for unwanted pests such as insects, rodents, and even scorpions.

Note: Opossums are NOT the same thing as possums. "Opossums" range from North America to southern Argentina and contain 15 genera with over 60 species. "Possums" are found in Australia with over 20 species. They are both marsupials, but are actually only distantly related within the same subclass.

Description:    A mature Short Tailed Opossum will reach a body length of about 4" - 6" (10 - 15 cm) with a tail that is about 1 1/2" - 3" (4 - 7.5 cm) and will weigh between 2 - 5 ozs (60 - 150 g). The males are about 25% larger than the females.
   The fur is a thick velvety gray-brown on top with a lighter tone underneath. They have a hairless prehensile tail used to grasp and balance while climbing. It is also great for carrying nesting materials and other things, but it is not weight bearing. They have a muzzle quite like a rat, with very sharp teeth. Their ears are large, very thin skinned, and sensitive to sound and their eyes bulge out giving them good night vision. The front legs are shorter than the hind legs. They have a life span of about 4 to 8 years.
   Babies are born premature, pink, and hairless. They are helpless, latching on to a nipple on their mothers stomach where they will stay until they are further developed.

Environment:   The Short Tailed Opossum is an escape artist, and must be kept in a secure enclosure. A 10 gallon or larger aquarium with a secure lid or a narrow-mess wire cage work well. Provide corn cob, Care Fresh litter, or shavings (though not cedar) for bedding and a nest box with some nesting materials such as cotton or shredded paper.
   For exercise and entertainment they will need things to climb on such as branches, ropes, or parrot ladders, and you can also give them a small hamster wheel. For some fun you can include such things as clay flowerpots, pvc tubes, and other places for them to hide. They need a draft free warm environment. Keep the temperature between 68° - 88° F. and at least a 50% humidity, a little on the warmer side is best for mothers with babies.
   They are neat clean little critters and will usually pick a corner of their enclosure for a bathroom. They can even be trained to use a litter-box, which makes cage cleaning much easier. Short Tailed Opossums are basically odor-free and their cage only needs to be cleaned about once a week.

Care and feeding:    Provide your Short Tailed Opossum with fresh water daily in a water bottle. For younger opossums that are not too strong, one without a steel ball works best.
    In the wild they eat insects, fruits, and vegetable matter. You can provide them a similar diet by offering mealworms, crickets, pinkie mice, fruits, vegetables, and breads.
   You can also offer them a high quality cat food, other dry foods such as a ferret food, or a commercially developed food called Briskey's Short Tail Possum feed. Supplement these by offering treats of crickets or mealworms a couple times a week as well as small amounts of fruits and vegetables.
  Other treats can include such things as super worms, hard boiled egg, scrambled egg, tuna, canned cat food, and fresh fruits and vegetables. Fresh fruits need to be cut up into small pieces so they can pick them up easily. Some quick and easy fruit options are the small Mott's Applesauce; Mixed Berry, Strawberry, or Tropical Blend fruit cups; or baby foods.

Social Behaviors:    A Short Tailed Opossum can become a friendly docile pet that can easily be handled by people and is curious, active, and entertaining.
   Because they are naturally solitary animals, they should be housed individually. The only time they should be put together with other opossums is when they are being bred, and then for only a short time. Cage mates will eventually become aggressive toward one another, possibly killing each other. Young opossums should be housed separately by the time they reach 9 weeks of age.

Dr. Jungle says..."What inquisitive little critters you are!"
"Kisak" and "Suki-da" are exploring!

   "Needless to say, every Short Tailed Opossum is different. They are a lot like humans in that sense. You can't base them on a group or how a group acts. Each one has its own distinct little personality.
   "Maybe someday I'll breed them and have their little kiddos running about, for now though... it's just all about Suki-da and Kisak. My worlds cutest little short tailed opossums"....Robin

See more cute picturesof
Kisak and suki-da
.
Plus Robin shares lots of good information on caring for Short Tailed Opossums!

Photo Courtesy: Robin White

Handling and Training:     If handled from a young age, a Short Tailed Opossum can become a loving gentle pet that generally will not bite. A good age to acquire your pet is between 3 and 4 months of age, though even some adults will adjust to being handled. They are friendly and inquisitive. Both males and females make equally good pets.

Activities - Exercise and Play:    The Short Tailed Opossum is nocturnal, meaning it is active at night. Be sure to give it lots of things to climb and perch on, such as branches, parrot ladders, and ropes. They will also enjoy a hamster wheel to run on.

 

Breeding/Reproduction:    Short Tailed possums are sexually mature at about 4 to 5 months of age. They will breed in any season, and can have up to 4 litters a year. When you introduce a pair, only keep them together for about 12 days.
   The gestation period is about two weeks and the female will have a litter size of up to about 13 babies. Unlike most marsupials, the female does not have a pouch so the new born babies, pink and hairless, will firmly attach themselves to a nipple on their mother's stomach. The mother will spend the majority of her time in the nest. At about 4 weeks of age, they young will begin to wander about the nest. They will cling to the fur on their mothers back and ride around with her when ever she leaves the nest. They will be weaned at about 8 weeks of age.
   Sometimes there can be up to 16 babies, but when the mother only has 13 nipples, babies that did not attach will not survive. Also, if a baby becomes detached, the nipple is enlarged and the baby will be unable to re-attach.

Ailments/Treatments:    Short Tail Opossums are very hardy little creatures. However, if not taken care of properly they can become ill. Most ailments are preventable simply from taking proper care of the animal. One reported health problem that can occasionally occur is a prolapse. You can treat your pet with ivermectin twice a year to help prevent this, but be sure to check with you veterinarian for this and any other illnesses.

Availability/Purchasing your Short Tailed Opossum:    Find a reputable breeder or retailer to purchase from. It is best to get one that is fairly young - between 3 and 4 months of age.
   One thing to take into consideration before you decide to purchase your Short Tailed Opossum is does your veterinarian treat exotic pets? Not all vets do, so you might want to check and make sure that there is a vet in your area that will treat your pet in case he gets sick.

Author: Clarice Brough
Lastest Animal Stories on Short Tailed Opossums


angie - 2014-12-17
I have a STO and he is great!! I have a question: he has started to lose his hair on his head in between his ears and a little on his butt. But he seems ok. eating fine, active... could it be from sleeping in his pouch?

  • Clarice Brough - 2014-12-17
    Hair loss could be from rubbing in his habitat or it could simply mean that your pet has dry skin. Dry flaky skin generally has to do with an underlying problem, usually diet, In hamsters it is a diet that is too low in protein. Sometimes dry skin can be alleviated in hamsters by adding a couple of drops of cod liver oil to the diet. On the other hand, it could be something else, like fur mites or mange (though more rare). These are occasionally found in small animals, and may require treatment. Allergies are another thought, sometimes a reaction to wood type beddings or detergents. You may want to take your pet to a veterinarian that works with exotic animals for a checkup, if you can't figure out what's going on.
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Angela Johnson - 2013-05-28
Hello everyone, i am a proud owner of a sto, for short, whose name is benny, jr. We have had him for a few months and he is so sweet and friendly, but, and i say but in caps for a reason;are you ready? He eats his own poop! ! It is so completely nasty and i have caught him already a few times doing it. I provide him with the special food they recommended at the exotic pet shop where we bought him- but why is he doing this? What makes it worse is that he gets it on his little 'fingers' and flings it about his home,(a fish aquarium. ) he makes such a mess and it is just so gross because then we don't want to handle him after seeing it stuck to his feet! ! Anyone have this problem?

  • Anonymous - 2013-05-28
    I have seen this with dogs. I don't know of any absolute cures, but I've seen products for dogs that may help. There is a discussion here and products here . I can't attest to how well any of them work (thank goodness I've not had to deal with this problem myself)
  • Laurel - 2014-11-30
    Some animals do eat their poop. Such as bunnies and guinea pigs. Maybe your animal does too.
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Tara - 2011-02-06
I have a very sick opossum. We have spent hundreds of dollars and have even traveled to the only exotic vet in our Province. It started with a white spot on his eye and 1 swollen toe then progressed to 3 swollen paws and a slightly swollen tail. We have been giving him an antibiotic oral and topical in his eye and also an antinflamatory eye drop. His paws have gone back to normal but now his tail is very crooked with swollen spots. I have changed his environment to a more humid and warm. I am at a loss and so are all the vets we have seen. We had blood work done and everything came back healthy except an elevated white blood cell count which they said was because of the swelling. Does anyone know what I can do and do opossums have allergies?

  • Alana - 2011-04-12
    How old is your opposum? Maybe you should try changing his food around, it's possible he might be allergic to something you're feeding him?
  • leah - 2014-06-07
    Try giving it Immunocal.
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Not telling - 2005-10-22
This website is amazing! I found all the information i need all on this page. I never new there could be a website like this. I think I know everything about short-tail possums now

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