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MacGregor's bowerbird
The MacGregor's bowerbird (''Amblyornis macgregoriae'') is a medium-sized, up to 26 cm long, olive brown bowerbird of New Guinea's mountain forests, roughly the size and shape of a robin. The male is adorned with an erectile orange yellow crest, that is partly hidden until shown in courtship display. The unadorned female is similar to the male, but without the crest. Superb mimics, they are known for imitating other birds, pigs, rushing water, and even human speech.
The polygamous male builds a tower-like "maypole-type" bower, with a central pole of twigs surrounded by a dish of moss with raised walls approximately 1 meter in diameter. He decorates the twigs of the maypole with flowers, fruits, insects and other objects. The diet consists mainly of fruits and insects. Bowerbirds are positioned roughly in the middle of the continuum of the "transfer effect" phenomenon observed among the different bowerbird species, whereby brilliant plumage evolves to more drab colors, while ornamentation is "transferred" to the behavior of creating elaborate bowers to demonstrate robust health instead.
When a female comes in proximity to the bower, the male struts and calls, and opens his crest to display its full color. Hiding the crest except during sexual display is thought to minimize his vulnerability to predators.
Widespread and common throughout its range, the MacGregor's bowerbird is evaluated as Least Concern on the IUCN Red List of Threatened Species.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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