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But when we find that it is not universal; that in two closely-allied species one will possess it and the other not; and that it is common in such widely-separated orders as gallinaceous and passerine birds, in pigeons, ducks, and waders, it becomes plain that it is not assignable to community of descent, but has originated independently all over the globe, in a vast number of species.
Birds of Prey, Perching birds, Scratching birds, Wading birds, Swimming birds, and I think I must add one more; for the Passerine, or Sparrow group includes most of the small birds, such as blackbirds and thrushes, nightingales and swallows, larks and magpies, linnets and humming-birds, and I cannot tell how many more "feathered fowl." Our story of a tame swallow must follow.
Among passerine birds I am also inclined to think that swallows show inherited fear of hawks.
A bird called here sangre-do-buey, blood of the ox, cannot fail to engage your attention: he is of the passerine tribe, and very common about the houses; the wings and tail are black and every other part of the body a flaming red.
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