Question

Why are the flocks of migratory birds mentioned in the passage?
(a) To describe an aspect of the fauna of South Africa
(b) To illustrate a possible source of food for large carnivores
(c) To contrast with the habits of the antelope
(d) To suggest the size of antelope herds​

Answer 1

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The flocks of migratory birds' is referred to suggest the large size of the antelope herds occupying the region. Birds migrate in huge numbers which is again magnified by the number of flocks.