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The cave swallow measures 12 to 14 cm in length and weighs 19 g on average. The largest of the five subspecies, P. f. pallida, has an average wing length between 107.0 and 112.3 mm; the smallest subspecies, P. f. aequatorialis, has an average wing length between 93.0 and 93.5 mm. Differences between the sexes are minimal, both are similar in size and weight and are difficult to distinguish ...
The Cave of Swallows, also called the Cave of the Swallows (Spanish: Sótano de las Golondrinas), is an open-air pit cave in the municipality of Aquismón, San Luis Potosí, Mexico. The elliptical mouth, on a slope of karst , is 49 by 62 m (161 by 203 ft) wide [ 2 ] and is undercut around all of its perimeter, widening to a room approximately ...
Not all cave dwelling species are considered to be troglobites. An animal found in an underground environment may be a troglophile (a species living both in subterranean and in epigean habitats, e.g. bats and cave swallows ) or a trogloxene (a species only occurring sporadically in a hypogean habitat and unable to establish a subterranean ...
The northern rough-winged swallow usually nests by itself, [5] although sometimes it is found in loose groups, often at the edge of bank swallow colonies, [6] of up to 25 pairs. [5] The nests are found in burrows located in soil banks, [ 12 ] very occasionally caves and trees, and in human-made cavities such as gutters and tubes.
American cliff swallow: Petrochelidon pyrrhonota: Canada and the United States of America, South American countries, such as Southern Brazil, Uruguay, and parts of Argentina. Cave swallow: Petrochelidon fulva: south-eastern New Mexico, Texas, Florida, the Greater Antilles, portions of southern Mexico, and along the west coast of South America.
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