Free Birds Wallpaper Biography
Suppose, after completing such a detailed study, a scientist is convinced that White-throated Swifts in one part of Arizona copulate in midair. How far can the researcher generalize such findings? Does it mean that White-throated Swifts everywhere copulate in midair? Do all other species of swifts copulate in midair? Ornithologists think all swifts are aerial maters. In fact, they assume that swifts are the only birds that do so on the wing. But they cannot be certain of either point. Maybe one obscure population of Palm Swifts in Asia actually mates only in their nests. And just possibly an Amazonian hummingbird, on occasion, copulates aerially above the canopy. That's why the authoritative Dictionary of Birds says, "Swifts are apparently unique in copulating in the air" (our emphasis). In short, statements by scientists are always provisional; they represent the best current evaluation of the situation, but are always subject to revision.
Suppose, after completing such a detailed study, a scientist is convinced that White-throated Swifts in one part of Arizona copulate in midair. How far can the researcher generalize such findings? Does it mean that White-throated Swifts everywhere copulate in midair? Do all other species of swifts copulate in midair? Ornithologists think all swifts are aerial maters. In fact, they assume that swifts are the only birds that do so on the wing. But they cannot be certain of either point. Maybe one obscure population of Palm Swifts in Asia actually mates only in their nests. And just possibly an Amazonian hummingbird, on occasion, copulates aerially above the canopy. That's why the authoritative Dictionary of Birds says, "Swifts are apparently unique in copulating in the air" (our emphasis). In short, statements by scientists are always provisional; they represent the best current evaluation of the situation, but are always subject to revision.
Free Birds Wallpaper
Free Birds Wallpaper
Free Birds Wallpaper
Free Birds Wallpaper
Free Birds Wallpaper
Free Birds Wallpaper
Free Birds Wallpaper
Free Birds Wallpaper
Amazing! Bird Sounds From The Lyre Bird - David Attenborough - BBC Wildlife
Sam Roberts - Some Birds
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