Question

Many varieties of birds needs to migrate.

Give suitable reason

Answer 1

Explanation:

Food may be the key to a regular migration, but birds migrate for other reasons related to helping their offspring survive, including: Climate: Birds have evolved different types of plumage to survive different climates, and changes in those climates can affect migration.

Answer 2

Answer:

the reason is favourable climate and favourable conditions..

eg. Siberian crane