*The baby koalas stay inside the mother's pouch so they wouldn't get eaten, lost, or damaged.

2) Researchers are worried because the koalas eat eucalyptus leaves and the heat from the sweltering summers is expected to result in even more extreme temperatures.

1) The koalas lifestyle is caused by their unusually small brains and the limited nutritional content of the eucalyptus leaves.

3) The koalas manage to keep cool during the summers by gravitating toward the part of the tree trunk or branch that is closer to the ground.