Eucalypt forests are a huge fire danger, so my theory is that koala is the fire warden of the dry sclerophyll forest of Australia. The leaves grow back more slowly in winter, but it also encourages growth by tipping the branches.
After some especially bad fires in California several years ago, I remember them saying that Eucalyptus trees were the reason the fires spread so fast. California needs Koalas! 😊
As koalas est a lot of leaves, how quickly do the leaves grow back, and what is the advantage to the eucalyptus?? ( Could google but....)