Red kangaroo has the ability to freeze the development of an embryo until the previous joey is able to leave the pouch. This is known as diapause, and will occur in times of drought and in areas with poor food sources. The composition of the milk produced by the mother varies according to the needs of the joey. In addition, red kangaroo mothers may "have up to three generations of offspring simultaneously; a young-at-foot suckling from an elongated teat, a young in the pouch attached to a second teat and a blastula in arrested development in the uterus". The kangaroo has also
Doria's tree-kangaroo it a bear-like appearance. It is mostly solitary and nocturnal. Its diet consists of various leaves, buds, flowers and fruits. The gestation period is about 30 days, after which, the single young remains in the mother's pouch for up to 10 months. Doria's tree-kangaro is an IUCN Red List Vulnerable species. Its forest habitat is threatened by logging and forest clearance. Being large sized, it's also hunted for its meat. Doria's tree-kangaroo Doria's tree-kangaroo ("Dendrolagus dorianus") is a tree-kangaroo endemic to Papua New Guinea. This marsupial is found in montane forests of southeastern New Guinea island, at elevations between 600–3650m.