Humming birds have a high metabolism. At might they enter a state of torpor to reduce energy loss when feeding is not possible.
During winter months, small mammals reduce their needs for food by entering into a state of deep sleep called winter sleep ,allowing their body temperature to drop for long periods of time.
Larger mammals, such as bears, that have large body fat stores enter hibernation , a time of reduced metabolism that allows them to periodically wake and move about.
In order to survive periods of droughts, animals in dry areas may create a refuge and enter a period of dormancy called aestivation in order to wait for rain to return.
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