Question

Which animal exclusively eat only eucalyptus leaves and nothing else?
A) Koala
B) Arctic tern
C) Catfish
D) Tropical cockroach

Answer 1

A koala only eats eucalyptus leaves

Answer 2

The Koala exclusively feed on the eucalyptus leaves.

These leaves are very fibrous and low in nutrition but they are extremely poisonous for some animals.The digestive system of Koala is designed in such a manner that it detoxify the poisonous chemicals in the leaves.These toxins produced by the gum trees act as the protection against leaf-eating animals like insects. Trees which grow on less fertile soils have more toxins than those growing on good soils which is the prime reason why Koalas  eat only certain types of eucalyptus and avoid them when they are growing on certain soils.