How do Tree Kangaroo breeds???

Tree kangaroos have no defined mating season, although mating does drop off from October to March in captivity. Females go into heat every 51-79 days. They have a gestation period of 39-45 days, the longest of any known marsupial. 1-2 days before birth, the females isolates herself. She then takes up the birthing position: sitting on the base of her tail with the tail between her legs. The joey is born less than 1 in (2.5 cm) in length. It takes 2 min for it to crawl into the mother's pouch, which she cleans right before birth, and then grab hold of a teat. It remains this way for 100 days. After 250 days it looks out of the pouch; after 300 days it ventures out after 350 days it is independent of the pouch.