Free Bird Wallpapers Biography
Many of the essays in this book are loaded with "weasel" words -- birds appear to do this, or seem to behave in a certain manner, or may respond in a particular way for the following reason. Surely, one would think scientists could be more definitive about the biology of such a well-known group of animals. But they cannot.
One reason for the uncertainty is the difficulty of finding out what a rapidly flying animal does. Two White-throated Swifts that touch briefly in flight may appear to be copulating, but how (short of bringing them down for a biological assay) can we be sure? How can we even be sure that the two birds tumbling in midair as they sweep past us down a canyon at forty miles an hour are a male and a female? Finding answers in such cases may require detailed, logistically difficult, and time-consuming research involving such things as netting, trapping, examining and banding birds, photographing them with high-speed cameras, and often clever experimental alterations of the birds or their environments.
Free Bird Wallpapers
Free Bird Wallpapers
Free Bird Wallpapers
Free Bird Wallpapers
Free Bird Wallpapers
Free Bird Wallpapers
Free Bird Wallpapers
Free Bird Wallpapers
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