The term 'TREE MARSUPIAL' refers to two different species of marsupials, the OPOSSUM and the possum. The OPOSSUM is a nocturnal mammal found in North and South America, while the possum is a marsupial found in Australia and New Guinea. Both species are arboreal, meaning they live in trees, and have a pouch in which they carry their young. They are both omnivorous, meaning they eat both plants and animals.