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
Seri's tree-kangaroo elevations. "Seri's tree-kangaroo is one of the most attractive members of the Doria's complex. Very young animals have a bright yellow tail and a very dark body, but as they age the tail darkens and the distinctive silvery tipping develops on the limbs. The heavily silver-frosted coat colour of adults blends extraordinarily well with the epiphytic mosses and lichens of the upper montane forest." Seri's tree-kangaroo Seri's tree-kangaroo ("Dendrolagus stellarum") is a species of tree-kangaroo native and endemic to montane forests of west-central New Guinea. Seri's tree-kangaroo was originally considered to be a subspecies of "Dendrolagus dorianus", but was elevated