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Wednesday, August 17, 2011

Pigeon



Beauty Of Animal | Pigeon | Nicobar pigeon, Caloenas nicobarica, the bathroom is found on small islands and coastal regions from the Nicobar Islands, east through the Malay Archipelago, the Solomon Islands and Palau. He is a member of the only living genus Caloenas.It dove is large, measuring 40 cm in length. The head is gray, like the upper neck feathers, which turns to anger green and copper toward the breast. Remiges breast and dark gray. The tail is very short and pure white. The rest of the plumage is green metal. The progress of the draft law is the key to a small dark blackish, legs and feet pale red solid. The cornea is the dark.Females are slightly smaller than males, they have a smaller bill and shorter handle anger and basement brown. Immature birds have a black tail and not nearly all of iridescence. There is hardly any difference across a wide range of birds. Until the strain C. Palau N.

The anger just pelewensis shorter neck, but otherwise almost identical.It's not a very vocal species, giving the low-pitched repeated word.On the basis of cladistic analysis and mtDNA of cytochrome b and 12S rRNA sequences, and is sometimes called the Nicobar pigeon closest living relative of the extinct didines (Raphinae), which include the famous Dodo (Raphus cucullatus). But the study, the original result in this outcome only, and only one possibility of several, even a limited sample of species, and not with very high confidence, either. In any case, nDNA β - fibrinogen data intron sequence of 7 consistent with the idea of ​​Raphinae as a species of pigeons (and not an independent family, as was previously thought because of apomorphies their strange), which was part of the radiation Indopacific variety, which belongs to the Dove Nicobar also  .

C. nicobarica columbiform is quite singular (although less than autapomorphic Raphinae fly), as well as, for example, described Pigeon teeth (Didunculus strigirostris) and was crowned pigeons (Goura), which is usually considered distinct subfamilies. And therefore, may also constitute another species Nicobar pigeon is now monotypic. While not one of the bathroom near the floor in the South East Asia and Wallacea not be ruled out as possible relative closest living for Raphinae, and Dove Nicobar makes it more acceptable candidate than, for example, a group of the Empire, pigeons and doves fruit, which seems to be a part of the radiation itself.If it was possible to clarify this time of deep phylogenies without a comprehensive study of all breeds Home Columbidae living remains to be seen. Turned on the primitive molecular clock used to infer the history of the ancestors of the Nicobar Pigeon and varied since didines to be both unreliable and miscalibrated. But what is little evidence available indicates that the Nicobar pigeon is still distinct from all other living forms of life since the Paleogene - probably sometime between 56-34000000 years during the Eocene, which is a major part of the Paleogene

From subfossil bones found on New Caledonia, Tonga, and the extinction of some species of Caloenas, described the Kanaka Pigeon (C. canacorum). Was about a quarter of the largest [verification needed] of the Nicobar pigeon. Because it must be a good source of food, and most likely they hunt by the settlers of the extinction of the first man from the islands of his homeland. It was probably extinct by the year 500 BC. Dove Liverpool ("C" maculatum) is the most recently extinct species from the locality of the Pacific is unknown, but may have disappeared in the 19th century, and most likely succumbed to European mice feet. Are placed in the Caloenas as well as the possibility of at least critical; affiliations are true is not currently, and may be likely to represent a genus distinct from the radiation Indopacific of Columbidae.

 
 

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