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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.
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 largest falcon is the gyrfalcon at up to 65 cm (26 in) in length. 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. [10]
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Adult female in Winnipeg, Manitoba, Canada Kestrel resting in an apple tree. Illustration of Falco sparverius Linnaeus: American kestrel by Ann Lee painted between 1770 to 1800 The American kestrel ( Falco sparverius ), is the smallest and most common falcon in North America.
The gyrfalcon (/ ˈ dʒ ɜːr ˌ f ɔː (l) k ən / or / ˈ dʒ ɜːr ˌ f æ l k ən /) [3] (Falco rusticolus), also abbreviated as gyr, is a bird of prey from the genus Falco (falcons and kestrels) and the largest species of the family Falconidae. [4]
Many authorities now support the split of falcons from the Accipitriformes, despite similar adaptations, due to the genetic evidence showing they are not closely related. [95] The largest species of falcon is the gyrfalcon (Falco rusticolus). Large females of this species can range up to 2.1 kg (4.6 lb), span 1.6 m (5.2 ft) across the wings and ...
The Falcons' new quarterback signed a four-year, $180 million contract with the team on March 11 of this year. It included a $50 million signing bonus and $100 million guaranteed.