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In fish:

 Migration is also seen in fish.

 Eels spend their life in rivers, but migrate to sea for laying eggs.

 When the eggs hatch, the young ones travel to river from where their parents had
migrated.

AESTIVATION:

Some animals rest throughout the summer in a shady and cool place. This is called
aestivation.

e.g. Snails and earthworm

HIBERNATION:

Some animals sleep throughout the winter. They are not active during this time. The is
called hibernation.

e.g. Black bear