Here's why:
* Australia's seasons are reversed: Autumn in the Northern Hemisphere is spring in Australia.
* Koalas are adapted to their environment: They are used to the changing weather patterns in Australia, including the dry season that roughly corresponds to autumn.
* They are primarily concerned with eating: Their diet consists mostly of eucalyptus leaves, which are abundant throughout the year.
So, while koalas may be a little more active during the cooler months, they don't have any special autumn rituals. They continue to eat, sleep, and rest in trees.