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Most birds have approximately 175 different muscles, mainly controlling the wings, skin, and legs. Overall, the muscle mass of birds is concentrated ventrally. The largest muscles in the bird are the pectorals, or the pectoralis major, which control the wings and make up about 15–25% of a flighted bird's body weight.
Feather variations. Feathers are epidermal growths that form a distinctive outer covering, or plumage, on both avian (bird) and some non-avian dinosaurs and other archosaurs. They are the most complex integumentary structures found in vertebrates [1] [2] and an example of a complex evolutionary novelty. [3] They are among the characteristics ...
Bird wing. The skeleton of a bird wing. Places of attachment of various groups of flight feathers are indicated. Bird wings are a paired forelimb in birds. The wings give the birds the ability to fly, creating lift . Terrestrial flightless birds have reduced wings or none at all (for example, moa ). In aquatic flightless birds ( penguins ...
Some migratory birds have adapted to use protein stored in many parts of their bodies, including protein from the intestines, as additional energy during migration. [149] Birds that employ many strategies to obtain food or feed on a variety of food items are called generalists, while others that concentrate time and effort on specific food ...
The anatomy of bird legs and feet is diverse, encompassing many accommodations to perform a wide variety of functions. [1] Most birds are classified as digitigrade animals, meaning they walk on their toes rather than the entire foot. [3] [4] Some of the lower bones of the foot (the distals and most of the metatarsal) are fused to form the ...
Winged lion – A lion with the wings of a bird. Body of one animal with legs and extra features of another Satyr men, satyr women, and satyr children. Adlet – A human with dog legs. Bes – An Egyptian god with the hindquarters of a lion. Lilitu – A woman with bird legs (and sometimes wings) found in Mesopotamian mythology.
Cloaca. A cloaca ( / kloʊˈeɪkə / kloh-AY-kə ), pl.: cloacae ( / kloʊˈeɪsi / kloh-AY-see or / kloʊˈeɪki / kloh-AY-kee ), is the rear orifice that serves as the only opening for the digestive, reproductive, and urinary tracts (if present) of many vertebrate animals. All amphibians, reptiles, birds, and a few mammals ( monotremes ...
Birds. The proventriculus is a standard part of avian anatomy, and is a rod shaped organ, located between the esophagus and the gizzard of most birds. [2] It is generally a glandular part of the stomach that may store and/or commence digestion of food before it progresses to the gizzard. [3] The primary function of the proventriculus is to ...