An example of homologous characters is the four limbs of tetrapods. Birds, bats, mice, and crocodiles all have four limbs. Sharks and bony fish do not. The ancestor of tetrapods evolved four limbs, and its descendents have inherited that feature — so the presence of four limbs is a homology. From fish to modern humans – comparative anatomy, homologies and evolution of the pectoral and forelimb musculature R. Diogo, 1 V. Abdala, 2 M. A. Aziz, 3 N. Lonergan 1 and B. A. Wood 1 1 Center for the Advanced Study of Hominid Paleobiology, Department of Anthropology, George Washington University, Washington, DC, USA 2Cited by:
In other studies, alternative hypotheses of homology were proposed based on adult morphology [95,96]. Here, we have evaluated an alternative hypothesis for the homology of the cranial vault in birds proposed or implied by the results of several studies of the Cited by: Jul 01, · RHAMPHOTHECAE, THE HORNY (keratinous) sheaths that cover the jaws in birds, show amazing diversity and provide some of the most compelling and easily appreciated examples of morphological adaptation in vertebrates (Storer ), such as forceps for probing in sandpipers, filters in ducks and flamingos, “teeth” for gripping fish in mergansers and gannets, and nutcrackers in Cited by:
Sep 01, · Equally to the avian HF, adult neurogenesis in mammals varies according to different tasks that have been used to study the role of newborn neurons in relation to function (activity), physiological and pathological stimuli (Christian et al., , Ming and Song, , Snyder et al., ). In mammals, adult neurogenesis in the DG supports Cited by: Birds have evolved a wide variety of adaptations for feeding on fish. Some behavioral adaptations include plunge diving, surface diving, skimming the surface, spearing, and stealing. Beak shapes are highly varied correlating with the different behavioral adaptations.
Highly conserved linkage homology between birds and turtles: Bird and turtle chromosomes are precise counterparts of each other February Chromosome Research 13(6) Homology describes organs in different animals that have a common evolutionary origin but may show a variety of forms and functions. Homologous structures are discussed including the wings of birds and bats, and the development of the ear ossicles. Vestigial organs and molecular homology .