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Lowering the body temperature to overcome adverse weather or cold and to conserve energy. It is usually daily but might be longer. Nightjars and swifts can do this, but they rarely do so in Australia. Mistletoebird has been known to do so[1] as well as hummingbirds[2].

It is rare in birds[2].

The Common Poorwill is the only bird known to hibernate[3].

References

  1. ^ Simpson & Day (1999). A Field Guide to the Birds of Australia, 6th Edition. Penguin. ISBN 0-691-04995-5. 
  2. ^ a b Frances, Peter; et al. (2007). Bird: The Definitive Visual Guide. Dorling Kindersley Inc. ISBN 1564582957. 
  3. ^ Terres, John K. (1980). The Audubon Society Encyclopedia of North American Birds. Alfred A. Knopf, Inc. ISBN 0394466519. 
Anatomy of an amiotic egg This article is part of Project Glossary, a All Birds project that aims to write comprehensive articles on each term related to animals.


Charadrius vociferus tx1 cropped This article is part of Project Bird Behaviour, a All Birds project that aims to write comprehensive articles on each behavioural term related to birds.
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