Changes

Most [[bird]]s [[Animal migration|migrate]] to avoid harsh seasonal conditions; the common poorwill, a type of [[nightjar]], is the only bird known to hibernate. Historically, [[swallow]]s were believed to hibernate at the bottom of ponds.

Most [[bird]]s [[Animal migration|migrate]] to avoid harsh seasonal conditions; the common poorwill, a type of [[nightjar]], is the only bird known to hibernate. Historically, [[swallow]]s were believed to hibernate at the bottom of ponds.

==Aestivation==

==Aestivation==

as noted above, aestivation is a behavior of certain animals, typically in hot climates, involving a period of dormant behaviour to avoid the extremes of summer. It is a rather less common behaviour than hibernation.  Animals that aestivate include certain types of [[crocodile]] and [[lungfish]]es.

As noted above, aestivation is a behavior of certain animals, typically in hot climates, involving a period of dormant behaviour to avoid the extremes of summer. It is a rather less common behaviour than hibernation.  Animals that aestivate include certain types of [[crocodile]] and [[lungfish]]es.

 

==References==

==References==

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[[Category:Biology]]

[[Category:Biology]]