Question

Many birds migrate to warmer climates in the spring. Find two reasons why?
A ) To get away from seasonal predators
B) Because of overpopulation in winter grounds
C) For better food supplies
D) To lay eggs and rear their young ones
I. C & D
II. A & C
III. B & D
IV. A & D

Answer 1

Avian species show seasonal movement to warmer climates in the spring and back when winter conditions arrive. Birds migrate for better food supplies and to lay eggs and rear their young ones.

Complete answer: Bird migration is the seasonal movement of avian species. Migration is undertaken by birds from north to south. Bird migration is the technique through which birds avail the benefits of seasonal variations in natural resources. Birds optimize food supplies and locations to lay eggs and rear their young ones. Birds migrate mainly due to a change in food availability or weather. Also, seasonal variations affect the number of offspring. Northern summers have longer days which provides more time to feed their young ones. On return of cooler weather birds return back to the warmer regions. Migratory birds fly north in the spring to breed in temperate regions and return in autumn or winter in the warmer regions of the south and this is the most common pattern of migration observed. When all the species of a bird population are not migratory it is called partial migration. Another common pattern seen is clockwise migration in which birds that fly towards the north tend to be further west and those flying south are further east. Most of the birds fly in flocks during migration.
Hence option I is correct, i.e., C & D options are correct

Note: Birds migrate due to unavailability of food or for searching nesting locations. The main pattern seen is the movement of birds towards the north in spring to breed and return to the south as winter conditions arrive. Most of the birds migrate in large groups called flocks.