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Rhynchopsitta
The thick-billed parrots are stocky brilliant green Neotropical parrots with heavy black beaks of genus ''Rhynchopsitta'' of thick billed macaw-like parrots. The genus comprises two extant species, the thick-billed parrot and the maroon-fronted parrot, as well as an extinct species from the Late Pleistocene in Mexico. The two extant taxa were formerly considered conspecific; they have become rare and are restricted to a few small areas in northern Mexico. The range of the thick-billed parrot formerly extended into the southwestern United States; attempts at reintroduction have been unsuccessful so far. Description The two living species have a similar overall appearance, the principal differences lying in their relative sizes and brightness of coloration. Both are mainly green, with red or maroon markings on the forehead, forecrown, broad superciliary stripe, and feathers on the bend of the wing, the carpal edge and the thighs. Their eye-rings are yellow, with the feet and b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thick-billed Parrot
The thick-billed parrot (''Rhynchopsitta pachyrhyncha'') is a medium-sized parrot endemic to Mexico that formerly ranged into the southwestern United States. Its position in parrot phylogeny is the subject of ongoing discussion; it is sometimes referred to as thick-billed macaw or thick-billed conure. In Mexico, it is locally called ''guacamaya'' ("macaw") or ''cotorra serrana'' ("mountain parrot"). Classified internationally as Endangered through IUCN, the thick-billed parrot's decline has been central to multiple controversies over wildlife management. In 2018, the estimated wild population in Mexico was 1,700. Taxonomy ''Pachyrhyncha'' is currently classified as a species of the genus '' Rhynchopsitta'' of macaw-like thick-billed parrots of which there are two extant species (the other being the maroon-fronted parrot), and one extinct species. However, recent molecular DNA studies indicate that ''pachyrhyncha'' and its sister species ''terrisi'' in genus ''Rhynchopsitta'' are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhynchopsitta Terrisi
The maroon-fronted parrot (''Rhynchopsitta terrisi'') is a large, macaw-like parrot. It is dark green with a dark red shoulder and a maroon forehead and eye-stripe. Its underside of the wings and tail appear to be black when it is in flight. It makes a high, rolling ''cr-a ak'' sound. Groups sound similar to the acorn woodpecker if they are heard from a distance. The species is endemic to northeastern Mexico, where only about 2500–3000 birds survive in the wild. Taxonomy ''R. terrisi'' is one of two extant and one extinct species of genus ''Rhynchopsitta'' of thick-billed parrots. Description The maroon-fronted parrot is a large mostly green parrot which measures in length and weighs .''CRC Handbook of Avian Body Masses'' by John B. Dunning Jr. (Editor). CRC Press (1992), . The adults have a dark maroon brow which extends over the rim of bare yellow skin that surrounds the eyes. They have a brighter red at the bend of the wing. The tail is long and pointed. The underside of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhynchopsitta Phillipsi
''Rhynchopsitta phillipsi'' is an extinct species of thick-billed parrot. It was described in 1997 from Late Pleistocene cave deposits from Nuevo León in northeastern Mexico. The specific epithet honours American ornithologist Allan Robert Phillips Allan Robert Phillips (October 25, 1914 – January 26, 1996) was an American ornithologist. He mainly studied bird Birds are a group of warm-blooded vertebrates constituting the class (biology), class Aves (), characterised by feathers, .... References Rhynchopsitta Birds described in 1997 Fossil taxa described in 1997 Pleistocene birds of North America {{parrot-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neotropical Parrot
The neotropical parrots or New World parrots comprise about 150 species in 32 genera found throughout South and Central America, Mexico, the Caribbean islands and the southern United States. Among them are some of the most familiar and iconic parrots, including the blue and gold macaw, sun conure, and yellow-headed amazon. The parrots of the New World have been known to Europeans since Columbus remarked upon them in his journal in 1492. Systematic descriptions of the birds were first available in German naturalist Georg Marcgraf's ''Historia Naturalis Brasiliae'' published in 1648, and English naturalist Mark Catesby's two-volume ''Natural History of Carolina, Florida and the Bahama Islands'' published in London in 1731 and 1743. Several species and one genus have become extinct in recent centuries. A second genus is extinct in the wild. Over a third of the extant species are classified as threatened by the IUCN. A few of these are in imminent danger of extinction with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quaternary Glaciation
The Quaternary glaciation, also known as the Pleistocene glaciation, is an alternating series of glacial period, glacial and interglacial, interglacial periods during the Quaternary period that began 2.58 Year#SI prefix multipliers, Ma (million years ago) and is ongoing. Although geologists describe this entire period up to the present as an "ice age", in popular culture this term usually refers to the Last Glacial Period, most recent glacial period, or to the Pleistocene epoch in general. Since Earth still has polar Ice sheet, ice sheets, geologists consider the Quaternary glaciation to be ongoing, though currently in an interglacial period. During the Quaternary glaciation, ice sheets appeared, expanding during glacial periods and contracting during interglacial periods. Since the end of the last glacial period, only the Antarctic ice sheet, Antarctic and Greenland ice sheets have survived, while other sheets formed during glacial periods, such as the Laurentide Ice Sheet, hav ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Extinct
Extinction is the termination of an organism by the death of its Endling, last member. A taxon may become Functional extinction, functionally extinct before the death of its last member if it loses the capacity to Reproduction, reproduce and recover. As a species' potential Range (biology), range may be very large, determining this moment is difficult, and is usually done retrospectively. This difficulty leads to phenomena such as Lazarus taxon, Lazarus taxa, where a species presumed extinct abruptly "reappears" (typically in the Fossil, fossil record) after a period of apparent absence. Over five billion species are estimated to have died out. It is estimated that there are currently around 8.7 million species of eukaryotes globally, possibly many times more if microorganisms are included. Notable extinct animal species include Dinosaur, non-avian dinosaurs, Machairodontinae, saber-toothed cats, and mammoths. Through evolution, species arise through the process of specia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fossils
A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in amber, hair, petrified wood and DNA remnants. The totality of fossils is known as the ''fossil record''. Though the fossil record is incomplete, numerous studies have demonstrated that there is enough information available to give a good understanding of the pattern of diversification of life on Earth. In addition, the record can predict and fill gaps such as the discovery of '' Tiktaalik'' in the arctic of Canada. Paleontology includes the study of fossils: their age, method of formation, and evolutionary significance. Specimens are sometimes considered to be fossils if they are over 10,000 years old. The oldest fossils are around 3.48 billion years to 4.1 billion years old. Early edition, published online before print. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Above Mean Sea Level
Height above mean sea level is a measure of a location's vertical distance (height, elevation or altitude) in reference to a vertical datum based on a historic mean sea level. In geodesy, it is formalized as orthometric height. The zero level varies in different countries due to different reference points and historic measurement periods. Climate change and other forces can cause sea levels and elevations to vary over time. Uses Elevation or altitude above sea level is a standard measurement for: * Geographic locations such as towns, mountains and other landmarks. * The top of buildings and other structures. * Mining infrastructure, particularly underground. * Flying objects such as airplanes or helicopters below a Transition Altitude defined by local regulations. Units and abbreviations Elevation or altitude is generally expressed as "metres above mean sea level" in the metric system, or " feet above mean sea level" in United States customary and imperial units. Com ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Climate Change (general Concept)
Present-day climate change includes both global warming—the ongoing increase in global average temperature—and its wider effects on Earth's climate system. Climate change in a broader sense also includes previous long-term changes to Earth's climate. The current rise in global temperatures is driven by human activities, especially fossil fuel burning since the Industrial Revolution. Fossil fuel use, deforestation, and some agricultural and industrial practices release greenhouse gases. These gases absorb some of the heat that the Earth radiates after it warms from sunlight, warming the lower atmosphere. Carbon dioxide, the primary gas driving global warming, has increased in concentration by about 50% since the pre-industrial era to levels not seen for millions of years. Climate change has an increasingly large impact on the environment. Deserts are expanding, while heat waves and wildfires are becoming more common. Amplified warming in the Arctic has cont ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
