Koalas are very endangered because their natural habitat of Eucalyptus scrubs is becoming less and less prevalent, Koalas need these trees to survive. The populations of this species are estimated at between 100,000 and 300,000 Koalas currently alive in the Australian continent; Koala habitat loss alone is responsible for killing many Koalas each year. Koala food sources are also becoming more scarce as Koala habitat is becoming less prevalent while Koala food sources are still necessary for Koalas to survive. Koalas can't survive without these trees, so as their natural habitats become more scarce populations decrease as well.