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Vocal Bird anatomy: Birds produce sounds through the air that passes through the Syrinx, which is shown close up in the bottom right. In order for birds to produce sound, they use an organ located above the lungs called the syrinx , which is composed of tracheal rings, syringeal muscles, Tympaniform membrane, and internal bony structures that ...
To understand the functional significance of eggshell spotting (or maculation) it is important to quantify this pigmentation [6] For the same reason, later eggs in a clutch are more spotted than early ones, as the female's store of calcium is depleted. Birds which build in trees generally have blue or greenish eggs, either spotted or unspotted ...
Birds have only one functional ovary (the left), while the other remains vestigial. In mammals including humans, the female ovary is homologous to the male testicle, in that they are both gonads and endocrine glands. Ovaries of some kind are found in the female reproductive system of many invertebrates that employ sexual reproduction. However ...
A sex organ, also known as a reproductive organ, is a part of an organism that is involved in sexual reproduction. Sex organs constitute the primary sex characteristics of an organism. Sex organs are responsible for producing and transporting gametes , as well as facilitating fertilization and supporting the development and birth of offspring.
Cloaca of a red-tailed hawk. A cloaca (/ k l oʊ ˈ eɪ k ə / ⓘ kloh-AY-kə), pl.: cloacae (/ k l oʊ ˈ eɪ s i / kloh-AY-see or / k l oʊ ˈ eɪ k i / kloh-AY-kee), or vent, is the rear orifice that serves as the only opening for the digestive (), reproductive, and urinary tracts (if present) of many vertebrate animals.
Female birds are able to produce more of a certain gender of birds that are more likely to survive under extreme conditions. In birds, the females' egg determines the gender of the offspring, not the male's sperm. In zebra finches, a study showed the effect of food on gender ratio production. For females, egg production is a metabolically ...
Male birds have two Z chromosomes (ZZ), and female birds have a W chromosome and a Z chromosome (WZ). [78] A complex system of disassortative mating with two morphs is involved in the white-throated sparrow Zonotrichia albicollis , where white- and tan-browed morphs of opposite sex pair, making it appear as if four sexes were involved since any ...
Pages in category "Bird anatomy" The following 66 pages are in this category, out of 66 total. This list may not reflect recent changes. ...