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The sheathbills are a family of birds, Chionidae.Classified in the wader order Charadriiformes, the family consists of one genus, Chionis with two species. They breed on subantarctic islands and the Antarctic Peninsula, and the snowy sheathbill migrates to the Falkland Islands and coastal southern South America in the southern winter; they are the only bird family endemic as breeders to the ...
It is a free-access, but not free-licensed, on-line audiovisual library [3] of the world's birds with the aim of posting videos, photos and sound recordings showing a variety of biological aspects (e.g. subspecies, plumages, feeding, breeding, etc.) for every species. It is a non-profit endeavour fuelled by material from more than one hundred ...
The eyes are small, but the pupils are relatively large, allowing the highest light-gathering capacity of any bird (f-number of 1.07). [8] The retina is dominated by rod cells , 1,000,000 rods per mm 2 , the highest density of any vertebrate eye, [ 8 ] which are organised in layers, an arrangement unique among birds but shared by deep-sea fish .
[1] DNA sequence analysis, specifically the mitochondrial gene sequencing, has been used to classify and differentiate the various aquatic birds. This classification is found by a relative apparent synapomorphy analysis (RASA) which highlighted certain branches of genes that classified the domestic duck and fowl, for example, as an outgroup.
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[8] [9] Both species breed in the Aleutian Islands. [6] It is also very similar to the pin-tailed snipe (G. stenura) and Swinhoe's snipe (G. megala) of eastern Asia; identification of these species there is complex. [10] The subspecies faeroeensis is normally more richly toned on the breast, its upperparts and the head than the nominate ...
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Males of the Chatham subspecies are 89–240 g (3.1–8.5 oz) and females 89–170 g (3.1–6.0 oz). [ 21 ] At first glance the bird appears completely black except for a small tuft of white feathers at its neck and a small white wing patch, causing it to resemble a parson in clerical attire.