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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 ...
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).
The American kestrel (Falco sparverius), is the smallest and most common falcon in North America. Though has been called the American sparrowhawk, this common name is a misnomer; the American kestrel is a true falcon, while the Eurasian sparrowhawk, Accipiter nisus, is not in the Falco genus and is thus genetically unrelated to the American ...
It will regularly take prey from the size of sparrows or finches to birds approximately its own weight, and occasionally much larger. The prairie falcon is the only larger falcon species native strictly to North America (others are found throughout the Americas and beyond, such as the peregrine falcon with its cosmopolitan distribution).
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Falcons and caracaras 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). They have strongly hooked bills, sharply curved talons and excellent eyesight.
The merlin (Falco columbarius) is a small species of falcon from the Northern Hemisphere, [2] with numerous subspecies throughout North America and Eurasia. A bird of prey, the merlin breeds in the northern Holarctic; some migrate to subtropical and northern tropical regions in winter. Males typically have wingspans of 53–58 centimetres (21 ...
The gyrfalcon is the largest falcon in the world, being about the same size as the largest buteos but probably slightly heavier. Males are 48 to 61 centimetres (19 to 24 inches) long, weigh 805 to 1,350 grams (1 pound 12 + 1 ⁄ 2 ounces to 2 pounds 15 + 1 ⁄ 2 ounces), with average weights reported as 1,130 or 1,170 g (2 lb 8 oz or 2 lb 9 + 1 ...