Search results
Results From The WOW.Com Content Network
The skin is removed from the animal's carcass, treated with absorbents, and filled with cotton or polyester batting (In the past plant fibres or sawdust were used). Bird specimens have a long, thin, wooden dowel wrapped in batting at their center. The dowel is often intentionally longer than the bird's body and exits at the animal's vent.
Grandry corpuscles are found in the superficial portion of the dermis in bill skin and oral mucosa of aquatic bird species. [2] [7] The specific location in the dermis varies between and within species; Grandry corpuscles have been observed at depths below the epidermis of 20-150 μm in domestic geese, 1-80 μm in greater white-fronted geese, [8] and 50-100 μm in mallards. [1]
Unlike other birds infected with T. gallinae, pigeons are susceptible to secondary organ invasion by virulent strains of the parasite. The visceral form of the disease involves the liver and gastrointestinal tract, causing organ dysfunction. When observed under a light microscope, samples can be seen rapidly moving in a circular jerky motion.
Gular skin (throat skin), in ornithology, is an area of featherless skin on birds that joins the lower mandible of the beak (or bill) to the bird's neck. [1] Other vertebrate taxa may have a comparable anatomical structure that is referred to as either a gular sac, throat sac, vocal sac or gular fold .
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.
The use of bird skins to document species has been a standard part of systematic ornithology. Bird skins are prepared by retaining the key bones of the wings, legs, and skull along with the skin and feathers. In the past, they were treated with arsenic to prevent fungal and insect (mostly dermestid) attack.
Bird ringing is the term used in the UK and in some other parts of Europe, while the term bird banding is more often used in the U.S. and Australia. [49] bird strike The impact of a bird or birds with an airplane in flight. [50] body down The layer of small, fluffy down feathers that lie underneath the outer contour feathers on a bird's body. [51]
Under the fourth definition Archaeopteryx, traditionally considered one of the earliest members of Aves, is removed from this group, becoming a non-avian dinosaur instead. These proposals have been adopted by many researchers in the field of palaeontology and bird evolution , though the exact definitions applied have been inconsistent.