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With colors that seem to glow with an unearthly radiance, a male Osa Anole (Anolis osa) betrays his normally cryptic appearance to briefly flash his extended dewlap. Anole lizards are famous for these flamboyant visual signals – they are used to attract mates, ward off rivals, and even sometimes dissuade potential predators. A 2015 study found that the translucent quality of anole dewlaps was a crucial component in their ability to transmit these color signals effectively, particularly in shady environments; under the right conditions they possess an almost unnatural luminance. This species, which is endemic to Costa Rica’s Osa Peninsula, spends most of its time on perches near ground level in the dappled light of the rainforest understory. Osa Peninsula, Puntarenas, Costa Rica.

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© Chien C. Lee
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Contained in galleries
Central & South America, Reptiles
With colors that seem to glow with an unearthly radiance, a male Osa Anole (Anolis osa) betrays his normally cryptic appearance to briefly flash his extended dewlap. Anole lizards are famous for these flamboyant visual signals – they are used to attract mates, ward off rivals, and even sometimes dissuade potential predators. A 2015 study found that the translucent quality of anole dewlaps was a crucial component in their ability to transmit these color signals effectively, particularly in shady environments; under the right conditions they possess an almost unnatural luminance. This species, which is endemic to Costa Rica’s Osa Peninsula, spends most of its time on perches near ground level in the dappled light of the rainforest understory. Osa Peninsula, Puntarenas, Costa Rica.