They do not interact with each other except in territorial disputes and to mate. He scent marks by urinating or rubbing a gland on his chest against a tree trunk declaring ownership of that tree. The bellow of the male is low pitched and can be heard for up to 800 meters. It may announce his presence to other males or to females. Females wail, snarl, and scream to communicate.
Marsupials are very small and underdeveloped when they are born.
Using powerful front legs and paws, it crawls into its mother's pouch and attaches to a nipple in order to drink milk, grow, and develop. By seven months of age, the joey pokes its head out and gradually starts to explore, squeaking to call for its mother. By 12 months the youngster is weaned, but will return to the pouch for safety until it is 18 months old. Soon after, the young koala leaves for good to find a home of its own. A koala leads a slow-paced life.