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1 giorno fa · The red-tailed hawk is the only North American hawk with a rufous tail and a blackish patagium marking on the leading edge of its wing (which is obscured only on dark morph adults and Harlan's hawks by similarly dark-colored feathers).
22 mag 2024 · Broad-winged Hawks also have a dark and a light morph. Adult dark morph is very rare and is dark brown overall. They have a broad white band on their tail. Juveniles are also dark brown overall but have white tails with dark barring. They may also show pale streaking on their underside.
3 giorni fa · We reveal the microevolutionary process underlying speciation: Hosts reject cuckoo nestlings, which selects for mimetic cuckoo nestling morphology. Where cuckoos exploit multiple hosts, selection for mimicry drives genetic and phenotypic divergence corresponding to host preference, even in sympatry.
24 mag 2024 · The flightless species comes in three camouflaging varieties, or morphs, that are inherited from one generation to the next. The plain green morph camouflages well on California lilac leaves, the white-striped morph disappears among chamise (an evergreen shrub), and the rarer dark morph lives on both plants but blends better with the ...
9 mag 2024 · Broad-winged hawks are easy to ID because, unlike most hawks in Georgia with black wings, they have broad wings with brown feathers. On top of that, broad-winged hawks have reddish-brown heads and barred underbellies. But, there is also a rare dark morph with dark brown plumage and a tail with a white band.
4 giorni fa · Size: 50-57 cm. Identification: This is a small crestless raptor with long square-cut tail and diagnostic pale shoulder spots (headlights) on the upperwing which occurs in two morph phases. Dark morph bird has uniform dark brown head and body, blackish flight feathers and pale brown underwing coverts.
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