In human beings, instinct reveals itself in such things as self-protection in the face of attack. ………. . They, for instance, build their nests entirely by instinct. More dramatic, perhaps, is the instinct that compels many species of bird to migrate. How this process works remains a mystery.
A)The eagle is known to have a sharp sense of instinct
B)In other animals, however, instinct plays a much larger role, as in the case of birds
C)Instinct requires no instruction, and even the smallest animal is instinctive
D)Birds, insects, mammals - all animal life forms rely on their instinct.
E)This is an inherited form of behaviour, common to all forms of animal