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The alaska red-tailed hawk was described by Joseph Grinnell (Glacier Bay, Alaska) in 1909 as "always blackest dorsally, and decidedly smaller" than a "large series" of the western red-tailed hawk (B. j. calurus). [3] B. j. alascensis and B. j. calurus were previously considered to be the same subspecies.
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 ...
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 ...
Pale morph adult ferruginous hawk can show mildly tawny-pink (but never truly rufous) upper tail, and like red-tails tend to have dark markings on underwing-coverts and can have a dark belly band, but compared to red-tailed hawks have a distinctly broader head, their remiges are much whiter looking with very small, dark primary tips, they lack ...
[3] [4] [9] Harlan's hawk is markedly different from all other red tails and can be identified nearly 100% of the time by an experienced hawk watcher. [4] [9] Throughout the morphs of this subspecies, the plumage is predominantly blackish, lacking any warmer or brownish tones (save the tail). Harlan's hawks usually have faint streaks on the ...
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.
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.
The pale morph of the closely related but more slender rough-legged species is best distinguished by its darker coloration, with a broad black tail band and a dark band across the chest. The dark morph Rough-leg is more a slaty coloration than the more brownish dark morph ferruginous.