Fort Worth Zoo - Marsupial Madness Koala Phascolarctos cinereus Mostly arboreal animals, koalas spend about 20 percent of their time feeding in the trees. Koalas will move from tree to tree in thick areas, but if trees are sparse they may have to travel on the ground to climb another tree.
Koalas are most active during the summer, which is also their breeding season.
During the breeding season, males will often wander about looking for a mate. After birth, the embryo must crawl to the mother's pouch, which has a muscle that the mother can tighten like a drawstring. Inside the pouch, the embryo attaches to a teat. The embryo's lips actually grow around the teat, which injects milk without choking the embryo. It is within the pouch that the embryo will finish developing over a period of five to seven months.