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
Phantom kangaroo animal was never found, and national news coverage drew widespread ridicule. In 1974 in Chicago, Illinois, two Chicago police officers were called to investigate a report that a kangaroo was standing in someone's porch. After a brief search, the officers located the animal in an alleyway, but were unable to capture it. Over the next month, numerous kangaroo sightings were reported in Illinois and the neighboring states of Indiana and Wisconsin, with timing suggesting more than one animal if reports were accurate. A kangaroo was seen the next day by a paperboy, the next week in , Illinois, and the