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
Kangaroo industry from whom, and the relevant tags numbers. The kangaroo management plans have been operating under strict and intensive supervision for almost 30 years. Over this period, the average harvest per year has been in excess of 2 million animals. Despite long-term harvests in excess of 2 million animals per year, the kangaroo population has consistently increased. Even following the worst drought on record (2005–07), numbers in 2008 are still at what could be considered historically typical levels. Their current population of 25 million is only marginally lower than the 25-year average of 26.7 million (which is skewed by the very