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In terms of size variation, red-tailed hawks run almost contrary to Bergmann's rule (i.e. that northern animals should be larger in relation than those closer to the Equator within a species) as one of the northernmost subspecies, B. j. alascensis, is the second smallest race based on linear dimensions and that two of the most southerly ...
Adults may show nearly endless variation in coloring and many may combine several characteristics of the three main morphs. Dark morph juveniles are usually mostly dark brown but with extensive pale mottling on the back and occasional tawny-edge feathers on the underside and slightly broader bars on the tail than pale morph B. j. calurus .
This is a large-bodied, relatively heavy race, but differs from more westerly hawks in having a relatively smaller wing area. Based on linear dimensions, this subspecies shows the most size variation and, unlike the red-tailed hawk species overall, size variation seems to fall within Bergmann's rule as northern birds average larger than southern ones.
Krider's hawk or Krider's red-tailed hawk (Buteo jamaicensis kriderii) [1] is a subspecies or color morph of red-tailed hawk. [2] Authorities vary in their treatment of the taxon . [ 3 ] [ 4 ] [ 5 ] It was named after John Krider , the gunsmith from Philadelphia who collected the type specimen, which is preserved in the collection of the ...
The Alaska red-tailed hawk (Buteo jamaicensis alascensis) is a subspecies of red-tailed hawk that breeds (and is probably resident) from southeastern coastal Alaska to Haida Gwaii (previously Queen Charlotte Islands) and Vancouver Island in British Columbia. [1] Despite its northerly distribution, this is the second smallest of the red-tailed ...
The southwestern red-tailed hawk (Buteo jamaicensis fuertesi) [1] is a subspecies of red-tailed hawk that breeds from northern Chihuahua to southern Texas. It winters in Arizona , New Mexico and southern Louisiana . [ 2 ]
A baby red-tailed hawk, right, was plucked by bald eagle parents and is now sharing a nest in San Simeon with two eaglets, seen on May 21, 2024.
In some birds, the rich rufous color continues to the underside. The chest is much less heavily streaked than in northern migrants western red-tailed hawk (B. j. calurus) to Central America. Unlike other Central American races of red-tailed hawk, there seems to be no dark morph in this subspecies. [1] [5] [6]