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The peregrine falcon became an endangered species over much of its range because of the use of organochlorine pesticides, especially DDT, during the 1950s, '60s, and '70s. [19] Pesticide biomagnification caused organochlorine to build up in the falcons' fat tissues, reducing the amount of calcium in their eggshells. With thinner shells, fewer ...
The aplomado falcon's habitat is dry grasslands, savannahs, marshes, and, in Brazil, is commonly observed in some large cities, such as São Paulo. [citation needed] It ranges from northern Mexico and Trinidad locally to southern South America, but has been extirpated from many places in its range, including all of northern and central Mexico except for a small area of Chihuahua.
The smallest falcon species is the pygmy falcon, which measures just 20 cm (7.9 in). As with hawks and owls , falcons exhibit sexual dimorphism , with the females typically larger than the males, thus allowing a wider range of prey species.
2003 – A population study by the USFWS shows peregrine falcon numbers climbing ever more rapidly, with well over 3000 pairs in North America Hunting falcon as depicted by Edwin Henry Landseer in 1837. 2006 – A population study by the USFWS shows peregrine falcon numbers still climbing. (Federal Register circa September 2006)
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Falconidae is a family of diurnal birds of prey and includes caracaras, laughing falcon, forest falcons, falconets, pygmy falcons, falcons and kestrels.They are small to medium-sized birds of prey, ranging in size from the black-thighed falconet, which can weigh as little as 35 grams (1.2 oz), to the gyrfalcon, which can weigh as much as 1,735 grams (61.2 oz).
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