Search results
Results from the WOW.Com Content Network
The carpometacarpus is a bone found in the hands of birds. It results from the fusion of the carpal and metacarpal bone, and is essentially a single fused bone between the wrist and the knuckles. It is a smallish bone in most birds, generally flattened and with a large hole in the middle.
The leg bones of birds are the heaviest, contributing to a low center of gravity, which aids in flight. A bird's skeleton accounts for only about 5% of its total body weight. They have a greatly elongate tetradiate pelvis, similar to some reptiles. The hind limb has an intra-tarsal joint found also in some reptiles.
From this they concluded that members of the genus Avisaurus existed in both North and South America in the Late Cretaceous. Moreover, the authors concluded that the length/width ratio and degree of metacarpal fusion of these bones were more like those of non — avian dinosaurs.
The species is known from subfossil bones and from mentions in contemporary ... The neognaths have fused metacarpals, ... There is also Birds of North America ...
For example, in the long-tailed duck, the leg and wing bones are not pneumatic, in contrast with some of the other bones, while loons and puffins have even more massive skeletons with no aired bones. [ 15 ] [ 16 ] The flightless ostrich and emu have pneumatic femurs , and so far this is the only known pneumatic bone in these birds [ 17 ] except ...
The distal carpals, while long, are in no way similar to those observed in the urvogel or other archaic birds. There is no semilunate element, and the structure of the radiale and ulnare would have limited the flexibility of the wrist joint. [7] [9] The manus is not tridactyl, and metacarpal V is
Birds of North America is a comprehensive encyclopedia of bird species in the United States and Canada, with substantial articles about each species.It was first published as a series of 716 printed booklets, prepared by 863 authors, and made available as the booklets were completed from 1992 through 2003. [1]
The taxonomic treatment [3] (designation and sequence of orders, families and species) and nomenclature (common and scientific names) used in the accompanying bird lists adheres to the conventions of the AOS's (2019) Check-list of North American Birds, the recognized scientific authority on the taxonomy and nomenclature of North America birds.