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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Birds standing on one leg: mechanisms and possible functions - a review. (2010)
Auteurs :	Reinhold Necker, Auteur
Type de document :	Article
Dans :	Vogelwarte (48(1) FEB 2010)
Article en page(s) :	43-49
Langues:	Allemand
Résumé :	Many buds stand on one leg when resting on the ground The leg is positioned in a way which needs not much energy In long-legged birds the body is far from the ground which may require special adaptations to keeping balance Snapping mechanisms which serve to "lock" the intertarsal pint when standing arc reviewed Such a mechanism is obviously present in the ostrich which does, however, not stand on one leg There is so far no convincing evidence that a snapping mechanism exists in long-legged birds which stand on one leg It seems that normal mechanisms of keeping balance also work in long-legged birds A recently discovered sense organ of equilibrium in the lumbosacral vertebral canal which controls leg movements may play an important role in standing on one leg. Hiding one foot in the plumage reduces heat loss in a cold environment. However, the foot is not always hidden in the plumage and standing on one leg occurs also in a warm environment, i e thermoregulation probably is not the only function of standing on one leg Another function of standing on one leg may be to avoid muscle fatigue. However, to tuck up one leg means muscle activity and It is not clear whether It saves energy There is a need for comparing energy (oxygen) consumption when standing on one leg as compared to standing on both legs both as to thermoregulatory and muscle relaxation function.

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