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 Seals have streamlined body that helps them to swim without
resistance.
 They have fur to keep them warm. The fur also acts like a water-
resistant layer.
 Another outstanding feature is their ability to emit sound at the bottom
of the sea which can reach long distances, reaching even the surface
of water in spite of ice.

Polar animals undergo long sleep called hibernation during extreme cold
conditions.

4. Siberian crane

 They undergo a process of moulting or shedding of feathers after their
wear and tear once or twice a year.

 They fly in groups to avoid predators.

Migration-seasonal movement of animals and birds from one region to another is
called migration.

Animals and birds migrate for the following reasons-