Roosters have an internal clock that makes them crow just before dawn, researchers find. ->
The Gunnison sage-grouse courts females by inflating its chest and making a popping sound -- but experts say this unusual U.S. bird is at the brink of extinction. ->
Parrots will trade for a better deal, if presented with a tastier option.
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Emperor penguins gain body heat using convection from the surrounding air. ->
Bats in Peru attack unsuspecting penguin chicks living in dark caves.
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More than 25 million birds were counted in just four days. ->
The owl whistles a one-note song that rhymes with the name of its island home. ->
The ubiquitous city dwellers descended from Middle Eastern racing pigeons, new DNA studies show.
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