(A) If they have put all their efforts into the perfection of one survival trick, they do not bother so much with general complexities of the world around them.

(B) So long as the ant eater had its ants and the Koala bear had gum leaves, then they are satisfied and the living is easy.

(C) It depends on how specialized they have become during the course of evolution.

(D) The non-specialists, however, the opportunists of the animal world ‘can never afford to relax.

(E) All animals have a strong exploratory urge, but for some it is more crucial than others.