#1 because of their unusually small brains #2 they worry because the koalas survive in the hot weather and if there is no more trees they couldn't survive in the summer #3 they manage to keep cool by hanging on to bark and there favorite type of tree is the eucalyptus tree because they give them enough sustain during cool winter months

the baby koalas have to stay in there mothers pouch for six months because if there go on the trees they can fall down