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
San Quintin kangaroo rat lives in a burrow with several entrances, none of which is usually concealed under shrubs. The burrow can be deep with a main passage and several side passages, and has about three nesting chambers and ten food storage chambers. The diet of this kangaroo rat is probably seeds and green shoots. This animal is nocturnal, and young have been seen at several different times of year, but mainly in the winter and spring. When this species was first described by American zoologist Laurence M. Huey in 1925, two large colonies of these kangaroo rats were known. Since then, virtually the