|
Eye-ring
The eye-ring of a bird is a ring of tiny feathers that surrounds the orbital ring, a ring of bare skin immediately surrounding a bird's eye. The eye-ring is often decorative, and its colour may contrast with adjoining plumage. The ring of feathers is sometimes incomplete, forming an eye arc. In the absence of a conspicuous eye-ring, the orbital ring of a bird is often referred to as the eye-ring. The bare orbital ring may be hardened or fleshy, or may form an eye-wattle (anatomy), wattle. These are useful field marks in many bird species, and the eye-ringed flatbill, eye-ringed tody-tyrant and eye-ringed thistletail are examples of species named for either of these. __NOTOC__ Function Eye-rings are believed to convey various types of signals between individual birds. Some eye-rings appear only at sexual maturity, while others suggest the individual's age or health status. Individual birds may be included or excluded from reproductive capability due to signals conveyed by the eye- ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eye-ringed Flatbill
The eye-ringed flatbill (''Rhynchocyclus brevirostris'') is a species of bird in the family Tyrannidae, the tyrant flycatchers. It is found in Mexico, every Central American country, and Colombia. Taxonomy and systematics The eye-ringed flatbill was Species description, originally described in 1847 as ''Cyclorhynchus brevirostris''. It has three subspecies, the Nominate subspecies, nominate ''R. b. brevirostris'' (Jean Cabanis, Cabanis, 1847), ''R. b. pallidus'' (Laurence C. Binford, 1965), and ''R. b. hellmayri'' (Ludlow Griscom, Griscom, 1932). For a time in the early twentieth century what is now the Pacific flatbill (''R. pacificus'') was also treated as a subspecies.Remsen, J. V., Jr., J. I. Areta, E. Bonaccorso, S. Claramunt, G. Del-Rio, A. Jaramillo, D. F. Lane, M. B. Robbins, F. G. Stiles, and K. J. Zimmer. Version 30 January 2025. A classification of the bird species of South America. American Ornithological Society. https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eye-ringed Thistletail
The eye-ringed thistletail (''Asthenes palpebralis'') is a species of bird in the Furnariinae subfamily of the ovenbird family Furnariidae. It is endemic to central Peru. Taxonomy and systematics The eye-ringed thistletail was long treated as a subspecies of the white-chinned thistletail (then ''Schizoeaca fuliginosa'', now ''Asthenes fuliginosa'') but was eventually separated as a species. They and several other species were in genus ''Schizoeaca'' but genetic data showed that the genus is embedded within ''Asthenes''.Remsen, J. V., Jr., J. I. Areta, E. Bonaccorso, S. Claramunt, G. Del-Rio, A. Jaramillo, D. F. Lane, M. B. Robbins, F. G. Stiles, and K. J. Zimmer. Version 28 September 2023. A classification of the bird species of South America. American Ornithological Society. https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm retrieved October 20, 2023Lloyd, H. (2020). Eye-ringed Thistletail (''Asthenes palpebralis''), version 1.0. In Birds of the World (T. S. Schulenberg, E ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eye-ringed Tody-tyrant
The eye-ringed tody-tyrant (''Hemitriccus orbitatus'') is a species of bird in the family Tyrannidae, the tyrant flycatchers. It is endemic to Brazil. Taxonomy and systematics The eye-ringed tody-tyrant has a complicated taxonomic history. It was originally described in 1831 as ''Euscarthmornis orbitatus''. In part of the twentieth century it was assigned to genus ''Idioptilon''. Both ''Euscarthmornis'' and ''Idioptilon'' were eventually merged into ''Hemitriccus''.Remsen, J. V., Jr., J. I. Areta, E. Bonaccorso, S. Claramunt, G. Del-Rio, A. Jaramillo, D. F. Lane, M. B. Robbins, F. G. Stiles, and K. J. Zimmer. Version 18 November 2024. A classification of the bird species of South America. American Ornithological Society. https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm retrieved November 26, 2024 The eye-ringed tody-tyrant is monotypic. Description The eye-ringed tody-tyrant is long and weighs . The sexes have the same plumage. Adults have a dark olive crown. They hav ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glossary Of Bird Terms
The following is a glossary of common English language terms used in the description of birds—warm-blooded vertebrates of the Class (biology), class Aves and the Origin of birds, only living dinosaurs. Birds, who have and the ability to (except for the approximately 60 extant species of flightless birds), are toothless, have , Oviparity, lay Eggshell, hard-shelled eggs, and have a high metabolic rate, a four-chambered heart, and a strong yet lightweight Bird skeleton, skeleton. Among other details such as size, proportions and shape, terms defining bird features developed and are used to describe features unique to the class—especially evolutionary adaptations that developed to aid bird flight, flight. There are, for example, numerous terms describing the complex structural makeup of feathers (e.g., , and ); types of feathers (e.g., , and feathers); and their growth and loss (e.g., , and ). There are thousands of terms that are unique to the study of birds. This glos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Common Blackbird
The common blackbird (''Turdus merula'') is a species of true thrush. It is also called the Eurasian blackbird (especially in North America, to distinguish it from the unrelated New World blackbirds), or simply the blackbird. It breeds in Europe, western Asia, and North Africa, and has been introduced species, introduced to Australia and New Zealand. It has a number of subspecies across its large range; a few former Asian subspecies are now widely treated as separate species. Depending on latitude, the common blackbird may be Resident bird, resident, partially Bird migration, migratory, or fully migratory. The adult male of the common blackbird (''Turdus merula merula'', the nominate subspecies), which is found throughout most of Europe, is all black except for a yellow eye-ring and Beak, bill and has a rich, melodious Bird vocalization, song; the adult female and juvenile have mainly dark brown plumage. This species breeds in woods and gardens, building a neat, cup-shaped nest, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
MacGillivray's Warbler
MacGillivray's warbler (''Geothlypis tolmiei'') is a species of New World warbler. These birds are sluggish and heavy warblers, preferring to spend most of their time on, or near the ground, except when singing. left, A MacGillivray's warbler pair by Bruce Horsfall MacGillivray's warbler was named by John James Audubon in honor of Scottish ornithologist William MacGillivray, although the proper credit to its discovery goes to John Kirk Townsend. The specific name was given in honor of William Fraser Tolmie. Adult MacGillivray's warblers are an olive-green color on their upperparts and dull yellow below. Males have black heads and breasts, while females and immature birds have drab light gray heads; both males and females have broken white eye-rings. The song is a series of repeated two-note phrases, gradually increasing in volume, ending with two single notes: ''jeeter jeeter jeeter JEETER JEETER jeet jeet''. MacGillivray's warblers are very similar to their eastern counterp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zosterops Poliogastrus Kikuyuensis
''Zosterops'' (meaning "eye-girdle") is a genus of passerine birds containing the typical white-eyes in the white-eye family Zosteropidae. The genus has the largest number of species in the white-eye family. They occur in the Afrotropical, Indomalayan, and Australasian realms. Typical white-eyes have a length of between . Their most characteristic feature is a conspicuous white feather ring around the eye, though some species lack it. The species in this group vary in the structural adaptations of the tongue. The ''Zosterops'' 'griseotinctus''group is an example of a "great speciator" inhabiting a vast area and showing a remarkable morphological differentiation on islands, some of which may be as close as apart. Systematics The genus ''Zosterops'' was introduced by the naturalists Nicholas Vigors and Thomas Horsfield in 1827. The name combines the Ancient Greek words ''zōstēros'' "belt" or "girdle" and ''ōpos'' "eye". The type species was designated as the Malagasy white- ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lesser White-fronted Goose
The lesser white-fronted goose (''Anser erythropus'') is a goose closely related to the larger greater white-fronted goose (''A. albifrons''). It breeds in the northernmost Palearctic, but it is a scarce breeder in Europe, with a reintroduction attempt in Fennoscandia. Taxonomy The lesser white-fronted goose was formally described in 1758 by the Swedish naturalist Carl Linnaeus in the tenth edition of his ''Systema Naturae'' under the binomial name ''Anas erythropus''. Linnaeus specified the type location as northern Europe but this was restricted to northern Sweden in 1913. The lesser white-fronted goose is now one of 11 species placed in the genus '' Anser'' that was introduced by the French zoologist Mathurin Jacques Brisson in 1760. The specific epithet comes from ''anser'', the Latin for "goose", and ''erythropus'', "red-footed", derived from the old Greek ''eruthros'' "red" and ''pous'' "foot". The species is monotypic: no subspecies are recognised. The lesser white-f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bird Anatomy
Bird anatomy, or the physiological structure of birds' bodies, shows many unique adaptations, mostly aiding flight. Birds have a light skeletal system and light but powerful musculature which, along with circulatory and respiratory systems capable of very high metabolic rates and oxygen supply, permit the bird to fly. The development of a beak has led to evolution of a specially adapted digestive system. Skeletal system Birds have many bones that are hollow ( pneumatized) with criss-crossing struts or trusses for structural strength. The number of hollow bones varies among species, though large gliding and soaring birds tend to have the most. Respiratory air sacs often form air pockets within the semi-hollow bones of the bird's skeleton. The bones of diving birds are often less hollow than those of non-diving species. Penguins, loons, puffins, and kiwis are without pneumatized bones entirely. Flightless birds, such as ostriches and emus, have pneumatized femurs and, in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
White-eye
The white-eyes are a family, Zosteropidae, of small passerine birds native to tropical, subtropical and temperate Sub-Saharan Africa, southern and eastern Asia, and Australasia. White-eyes inhabit most tropical islands in the Indian Ocean, the western Pacific Ocean, and the Gulf of Guinea. Discounting some widespread members of the genus '' Zosterops'', most species are endemic to single islands or archipelagos. The silvereye, ''Zosterops lateralis'', naturally colonised New Zealand, where it is known as the "wax-eye" or ''tauhou'' ("stranger"), from 1855. The silvereye has also been introduced to the Society Islands in French Polynesia, while the Japanese white-eye has been introduced to Hawaii. Characteristics White-eyes are mostly of undistinguished appearance, the plumage being generally greenish olive above, and pale grey below. Some species have a white or bright yellow throat, breast, or lower parts, and several have buff flanks. As their common name implies, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reproductive Isolation
The mechanisms of reproductive isolation are a collection of evolutionary mechanisms, ethology, behaviors and physiology, physiological processes critical for speciation. They prevent members of different species from producing offspring, or ensure that any offspring are sterile. These barriers maintain the integrity of a species by reducing gene flow between related species.Strickberger, M. 1978. ''Genética''. Omega, Barcelona, España, p.: 874–879. .Futuyma, D. 1998. ''Evolutionary biology'' (3ª edición). Sinauer, Sunderland. The mechanisms of reproductive isolation have been classified in a number of ways. Zoologist Ernst Mayr classified the mechanisms of reproductive isolation in two broad categories: pre-zygotic for those that act before fertilization (or before mating in the case of animals) and post-zygotic for those that act after it.Mayr, E. 1963. ''Animal species and evolution''. Harvard University Press, Cambridge. The mechanisms are genetics, genetically controlle ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Speciation
Speciation is the evolutionary process by which populations evolve to become distinct species. The biologist Orator F. Cook coined the term in 1906 for cladogenesis, the splitting of lineages, as opposed to anagenesis, phyletic evolution within lineages. Charles Darwin was the first to describe the role of natural selection in speciation in his 1859 book ''On the Origin of Species''. He also identified sexual selection as a likely mechanism, but found it problematic. There are four geographic modes of speciation in nature, based on the extent to which speciating populations are isolated from one another: allopatric speciation, allopatric, peripatric speciation, peripatric, parapatric speciation, parapatric, and sympatric speciation, sympatric. Whether genetic drift is a minor or major contributor to speciation is the subject of much ongoing discussion. Rapid sympatric speciation can take place through polyploidy, such as by doubling of chromosome number; the result is progeny wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
