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Hanging parrots are birds in the genus Loriculus, a group of small parrots from tropical southern Asia. About 13 cm (5.1 in) long, hanging parrots are mostly green plumaged and short-tailed. Often head coloring helps to identify individual species. [1] They are unique among birds for their ability to sleep upside down. [2]
Lendrum discovered that the birds in the calm environment spent substantially more time with their eyes closed than those in the aggressive environment. [2] Lendrum collected data on the doves' opened- and closed-eye sleep; flocking was associated with an increase in a bird's overall eye-closure time and a decrease in its amount of eye-opening. [2]
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Sleep can follow a physiological or behavioral definition. In the physiological sense, sleep is a state characterized by reversible unconsciousness, special brainwave patterns, sporadic eye movement, loss of muscle tone (possibly with some exceptions; see below regarding the sleep of birds and of aquatic mammals), and a compensatory increase following deprivation of the state, this last known ...
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Many sleeping birds bend their heads over their backs and tuck their bills in their back feathers, although others place their beaks among their breast feathers. Many birds rest on one leg, while some may pull up their legs into their feathers, especially in cold weather.
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