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Sandra L. Vehrencamp
Sandra Lee Vehrencamp (born February 11, 1948, in Glendale, California), is a scientist, teacher, and mentor who specializes in Behavioral ecology, with a geographical focus on avian species in Costa Rica. She served as a faculty member of Cornell University's Lab of Ornithology and Department of Neurobiology and Behavior and taught graduate students while conducting research until retiring as of October 2010. She currently resides in Ithaca, New York, with her husband, Jack Bradbury. Education She graduated from Crescenta Valley High School in La Crescenta, California, in 1965. She went on to receive her bachelor's degree in zoology with honors from the University of California at Berkeley in 1970, and her Ph.D in Animal Behavior from Cornell University in 1976. After her extensive education, she started her career in research. Personal and early life Vehrencamp grew up in La Crescenta, California, and attended Crescenta Valley High School. During the time period Sandra Vehrenca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Behavioral Ecology
Behavioral ecology, also spelled behavioural ecology, is the study of the evolutionary basis for animal behavior due to ecological pressures. Behavioral ecology emerged from ethology after Niko Tinbergen outlined four questions to address when studying animal behaviors: What are the proximate causes, ontogeny, survival value, and phylogeny of a behavior? If an organism has a trait that provides a selective advantage (i.e., has adaptive significance) in its environment, then natural selection favors it. Adaptive significance refers to the expression of a trait that affects fitness, measured by an individual's reproductive success. Adaptive traits are those that produce more copies of the individual's genes in future generations. Maladaptive traits are those that leave fewer. For example, if a bird that can call more loudly attracts more mates, then a loud call is an adaptive trait for that species because a louder bird mates more frequently than less loud birds—thus sending mo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Behavioral Ecology
Behavioral ecology, also spelled behavioural ecology, is the study of the evolutionary basis for animal behavior due to ecological pressures. Behavioral ecology emerged from ethology after Niko Tinbergen outlined four questions to address when studying animal behaviors: What are the proximate causes, ontogeny, survival value, and phylogeny of a behavior? If an organism has a trait that provides a selective advantage (i.e., has adaptive significance) in its environment, then natural selection favors it. Adaptive significance refers to the expression of a trait that affects fitness, measured by an individual's reproductive success. Adaptive traits are those that produce more copies of the individual's genes in future generations. Maladaptive traits are those that leave fewer. For example, if a bird that can call more loudly attracts more mates, then a loud call is an adaptive trait for that species because a louder bird mates more frequently than less loud birds—thus sending mo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Ornithologists' Union
The American Ornithological Society (AOS) is an ornithological organization based in the United States. The society was formed in October 2016 by the merger of the American Ornithologists' Union (AOU) and the Cooper Ornithological Society. Its members are primarily professional ornithologists, although membership is open to anyone with an interest in birds. The society publishes the two scholarly journals, ''The Auk'' and '' The Condor'' as well as the ''AOS Checklist of North American Birds''. In 2013, the American Ornithologists' Union announced a close partnership with the Cooper Ornithological Society, including joint meetings, a centralized publishing office, and a refocusing of their respective journals to increase efficiency of research. In October 2016, the AOU announced that it was ceasing to operate as an independent union and was merging with the Cooper Ornithological Society to create the American Ornithological Society. History The American Ornithologists' Unio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Western Hemisphere
The Western Hemisphere is the half of the planet Earth that lies west of the prime meridian (which crosses Greenwich, London, United Kingdom) and east of the antimeridian. The other half is called the Eastern Hemisphere. Politically, the term Western Hemisphere is often used as a metonymy for the Americas, even though geographically the hemisphere also includes parts of other continents. . Geography The Western Hemisphere consists of the , excluding some of the |
Greater Sage-grouse
The greater sage-grouse (''Centrocercus urophasianus''), also known as the sagehen, is the largest grouse (a type of bird) in North America. Its range is sagebrush country in the western United States and southern Alberta and Saskatchewan, Canada. It was known as simply the sage grouse until the Gunnison sage-grouse was recognized as a separate species in 2000. The Mono Basin population of sage grouse may also be distinct. The greater sage-grouse is a permanent resident in its breeding grounds but may move short distances to lower elevations during winter. It makes use of a complex lek system in mating and nests on the ground under sagebrush or grass patches. It forages on the ground, mainly eating sagebrush but also other plants and insects. Greater sage-grouse do not have a muscular crop and are not able to digest hard seeds like other grouse. The species is in decline across its range due to habitat loss, and has been recognized as threatened or near threatened by several n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Groove-billed Ani
The groove-billed ani (''Crotophaga sulcirostris'') is a tropical bird in the cuckoo family with a long tail and a large, curved beak. It is a resident species throughout most of its range, from southern Texas, central Mexico and The Bahamas, through Central America, to northern Colombia and Venezuela, and coastal Ecuador and Peru. It only retreats from the northern limits of its range in Texas and northern Mexico during winter. Taxonomy The groove-billed ani was formally described by the English naturalist William John Swainson from a specimen collected in Temascaltepec, Mexico. It still bears its original binomial name of ''Crotophaga sulcirostris''. The specific epithet combines the Latin meaning "furrow" with ''-'' meaning "-billed". The species is monotypic: no subspecies are recognised. Description The groove-billed ani is about long, and weighs . Wingspan ranges 41-46 cm (16-18 in). It is completely black, with a very long tail almost as long as its body. It has a huge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Competition
Competition is a rivalry where two or more parties strive for a common goal which cannot be shared: where one's gain is the other's loss (an example of which is a zero-sum game). Competition can arise between entities such as organisms, individuals, economic and social groups, etc. The rivalry can be over attainment of any exclusive goal, including Recognition (sociology), recognition: Competition occurs in nature, between living organisms which co-exist in the same natural environment, environment. Animals compete over water supplies, food, mates, and other resource (biology), biological resources. Humans usually Survival of the fittest, compete for food and mates, though when these needs are met deep rivalries often arise over the pursuit of wealth, power, prestige, and celebrity, fame when in a static, repetitive, or unchanging environment. Competition is a major tenet of market economy, market economies and business, often associated with business competition as companies a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brewster Medal
The William Brewster Memorial Award, usually referred to as the Brewster Medal, is awarded by the American Ornithologists' Union and is named for ornithologist William Brewster. It is given to an author, or coauthors who are not previous recipients, of an exceptional body of work on Western Hemisphere birds. The award comprises a medal and an honorarium provided through the William Brewster Memorial Fund. Established in 1919, the award was first given in 1921, to Robert Ridgway. From 1921 to 1937, it was given biennially; since then it has usually been made annually. List of winners SourceAOU {, - , valign="top" , * 1921: Robert Ridgway (1850–1929) * 1923: Arthur Cleveland Bent (1866–1954) * 1925: W. E. Clyde Todd (1874–1969) and Melbourne Armstrong Carriker (1879–1965) * 1927: John Charles Phillips (1876–1938) * 1929: Carl Eduard Hellmayr (1878–1944) * 1931: Florence Augusta Merriam Bailey (1863–1948) * 1933: Frank Chapman (1864–1945) * 1935: Herbert Lee St ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bird Vocalization
Bird vocalization includes both bird calls and bird songs. In non-technical use, bird songs are the bird sounds that are melodious to the human ear. In ornithology and birding, songs (relatively complex vocalizations) are distinguished by function from calls (relatively simple vocalizations). Definition The distinction between songs and calls is based upon complexity, length, and context. Songs are longer and more complex and are associated with territory and courtship and mating, while calls tend to serve such functions as alarms or keeping members of a flock in contact. Other authorities such as Howell and Webb (1995) make the distinction based on function, so that short vocalizations, such as those of pigeons, and even non-vocal sounds, such as the drumming of woodpeckers and the "winnowing" of snipes' wings in display flight, are considered songs. Still others require song to have syllabic diversity and temporal regularity akin to the repetitive and transformative patte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Banded Wren
The banded wren (''Thryophilus pleurostictus'') is a small songbird of the wren family. It is a resident breeding species from central Mexico to Costa Rica. It was formerly placed in the genus ''Thryothorus'' (Mann et al., 2006). This wren breeds in lowlands and foothills from sea level up to 800 m altitude in open or scrubby woodland, including forest clearings and second growth. It mainly occurs on the Pacific side of the central mountain ranges. Its flask-shaped nest has a long entrance tube angled downward and is lined with fine grasses. It is constructed 1–2.5 m high in a fork of a thorny tree or shrub, often close to a wasp nest. The female alone incubates the three or four unspotted white or pale greenish-blue eggs for about two weeks to hatching, and the young fledge in about the same length of time again. The adult banded wren is 13.5 cm long and weighs 20 g. It has chestnut brown upperparts, strong white supercilia, a brown stripe through the eye ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Song Sparrow
The song sparrow (''Melospiza melodia'') is a medium-sized New World sparrow. Among the native sparrows in North America, it is easily one of the most abundant, variable and adaptable species. Description Adult song sparrows have brown upperparts with dark streaks on the back and are white underneath with dark streaking and a dark brown spot in the middle of the breast. They have a brown cap and a long brown rounded tail. Their face is gray with a brown streak through each eye. They are highly variable in size across numerous subspecies (for subspecies details, see below). The body length ranges from and wingspan can range from . Body mass ranges from . The average of all races is but the widespread nominate subspecies (''M. m. melodia'') weighs only about on average. The maximum lifespan in the wild is 11.3 years. The eggs of the song sparrow are brown with greenish-white spots. Females lay three to five eggs per clutch, with an average incubation time of 13–15 days befor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Groove-billed Ani
The groove-billed ani (''Crotophaga sulcirostris'') is a tropical bird in the cuckoo family with a long tail and a large, curved beak. It is a resident species throughout most of its range, from southern Texas, central Mexico and The Bahamas, through Central America, to northern Colombia and Venezuela, and coastal Ecuador and Peru. It only retreats from the northern limits of its range in Texas and northern Mexico during winter. Taxonomy The groove-billed ani was formally described by the English naturalist William John Swainson from a specimen collected in Temascaltepec, Mexico. It still bears its original binomial name of ''Crotophaga sulcirostris''. The specific epithet combines the Latin meaning "furrow" with ''-'' meaning "-billed". The species is monotypic: no subspecies are recognised. Description The groove-billed ani is about long, and weighs . Wingspan ranges 41-46 cm (16-18 in). It is completely black, with a very long tail almost as long as its body. It has a huge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
