It is because of this they need to have areas of suitable eucalypt forest, which are large enough to support a healthy koala population and to allow for expansion by maturing young koalas.

• 这充分说明考拉不是熊。同一物种的定义，是在自然条件下自由交配能产生可育后代。一只考拉和一只熊，如果能交配，也不能产生可育后代。因此，考拉和任意一种熊都不属于同一物种。