acrobatidae africa ameridelphia animal antarctica antechinus arboreal asia australia australidelphia australosphenida bandicoot bilby biological classification borhyaenidae carboniferous carnivora central america china chordate climate cloaca common brushtail possum cretaceous dasyuridae dasyuromorphia devonian diprotodon diprotodontia dunnart eastern grey kangaroo embryo europe eutheria extinction feather-tailed possum feathertail glider fossil gastrotheca gondwana great american interchange honey possum hoof hopping mouse hypsiprymnodontidae immune system indonesia johann karl wilhelm illiger jurassic koala mahogany glider mammal mesozoic metatheria microbiotheria monito del monte musky rat-kangaroo north america numbat opossum ordovician penis peramelemorphia peramelidae permian petauridae phalangeridae phascolarctidae pig-footed bandicoot placenta possum primate pseudocheiridae quoll semen shrew opossum silurian sinodelphys south america sparassodonta species squirrel glider striped possum sugar glider sulawesi tasmanian devil taxonomy tertiary theria thylacine thylacinidae thylacoleonidae thylacosmilus tim flannery triassic uterus vagina virginia opossum wikispecies wing wombat yellow-bellied glider