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The eastern species is smaller than the western jackdaw, and in eastern adults, the pale areas of the plumage are almost white, whereas in the western bird, these areas are pale grey. The iris is pale in western jackdaw and dark in Daurian jackdaw. The two species are otherwise very similar in shape, calls, and behaviour.
However, in Old English, and in modern English up to about the 18th century, "bird" was used only for smaller or young birds, and larger ones such as crows were called "fowl". At that time, the blackbird was therefore the only widespread and conspicuous "black bird" in the British Isles. [9]
Female, Guatemala. The great-tailed grackle or Mexican grackle (Quiscalus mexicanus) is a medium-sized, highly social passerine bird native to North and South America.A member of the family Icteridae, it is one of 10 extant species of grackle and is closely related to the boat-tailed grackle and the extinct slender-billed grackle. [2]
The male, which averages 122 g (4.3 oz), is larger than the female, at an average of 94 g (3.3 oz). [8] Adults have a long, dark bill, pale yellowish eyes, and a long tail; their feathers appear black with purple, green, or blue iridescence on the head, and primarily bronze sheen in the body plumage. Adult females, beyond being smaller, are ...
Immature birds have duller and less demarcated plumage. [37] The head is a sooty black, sometimes with a faint greenish sheen and brown feather bases visible; the back and side of the neck are dark grey and the underparts greyish or sooty black. The tail has narrower feathers and a greenish sheen. [36] There is very little geographic variation ...
Steller's jay has a more slender bill and longer legs than the blue jay and, in northern populations, has a much more pronounced crest. [9]: 69 [10] It is also somewhat larger. The head is blackish-brown, black, or dark blue, depending on the subspecies of the bird, with lighter streaks on the forehead.
Many of the largest flying birds in the fossil record may have been members of the Ciconiiformes. The heaviest flying bird ever, Argentavis magnificens, is part of a group, the teratorns, that is considered an ally of the New World vultures. [84] The largest ibis is the giant ibis (Thaumatibis gigantea). Adults can grow to 102–106 cm (40–42 ...
The lists of birds in the light blue box below are divided by biological family. The lists are based on The AOS Check-list of North American Birds of the American Ornithological Society [ 1 ] and The Clements Checklist of Birds of the World [ 2 ] supplemented with checklists from Panama, Greenland, and Bermuda.