• It is a dormant stage in the development of an organism.

• It occurs both in summer and winter.

• During this period there is reduction in the amount of free water.

• It is common among insects such as monarch butterflies, and in the embryos of many of the oviparous species of fish in the order Cyprinodontiformes.

• It is a state of inactivation in an ectothermic mature organism.

• It occurs only in winter. It is winter sleep in which animal passes the winter period in dormant condition.

• There is no such adaptation.

• Californian pocket mouse and kangaroo mouse and bats are known to hibernate. Several insects, small birds and mammals hibernate regularly each year.

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