Red kangaroo unusual ability to delay birth of their baby until their previous Joey has left the pouch. This is called embryonic diapause. Copulation may last 25 minutes. The red kangaroo has the typical reproductive system of a kangaroo. The neonate emerges after only 33 days. Usually only one young is born at a time. It is blind, hairless, and only a few centimetres long. Its hind legs are mere stumps; it instead uses its more developed forelegs to climb its way through the thick fur on its mother's abdomen into the pouch, which takes about three to five minutes. Once in
Wondiwoi tree-kangaroo in decline due to hunting pressures. Although the area has not been well-sampled, there have been a few visits to the area with no reports of this species." In 2018, a British amateur botanist photographed what is believed to be a living specimen of the Windiwoi tree-kangaroo in the mountains of New Guinea . The species status of Dendrolagus mayri is uncertain. Some authorities refer to all 'dorianus type' tree kangaroos as subspecies of Doria's tree kangaroo, including Colin Groves, who published a major revision of the taxonomy of the genus in 1982. More recent DNA analysis indicates, however, that