is a specific kind of: marsupial, pouched mammal.

is a broader term that covers: cuscus | brush-tailed phalanger, Trichosurus vulpecula | flying opossum, flying phalanger, flying squirrel | kangaroo bear, koala, koala bear, native bear, Phascolarctos cinereus.

is a member of: family Phalangeridae, Phalangeridae.