Sugar gliders (Petaurus breviceps) are originally from Australia, Tasmania, Papua-New Guinea, and Indonesia. They have been bred in captivity in the USA and UK for around 15 years. They are part of the marsupial infraclass and their closest relatives include possums, koalas, wallabies, and kangaroos. The name "sugar glider" comes for their preference for sweet foods such as nectar and their ability to glide through the trees, using a membrane similar to a flying squirrel. Sugar gliders are nocturnal marsupials which mean that they raise their young in a pouch and sleep during the day. They are very small mammals, averaging about the size of a hamster. Adults weigh between 4 and 5 ounces, whereas babies are no larger than a grain of rice at birth.
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