Free Birds Wallpapers Download Biography
A related problem is that there are more than 9,700 species of birds, and, as we know, they are a rather diverse lot. Suppose, for instance, we wished to know whether female birds prefer males that hold superior territories. Just determining whether females of one species in one habitat have that preference is not a simple task. The territories of males must be mapped and criteria to judge territorial quality must be found. For example, to compare territories within a population of insect eaters an ecologist may be required to do many careful censuses of insect abundance during the breeding season, without disturbing the breeding birds. Finally, of course, the female choices must be evaluated, most likely by counting the number of nests and the number of young fledged within each male's territory, often a difficult task in itself.
So much for finding the answer for one species in one locality -- how about other localities? And, since male birds of most species are territorial, what about other species? Obviously, it would be a mistake to generalize from the behavior of one population living in one habitat to all species of birds in all habitats. It would be necessary to see if female choices were made not only in a variety of species, but also in different habitats. If this were done, a pattern should emerge slowly, and with it an opportunity to draw tentative conclusions. Further studies may tend to confirm or refute those initial conclusions, and after enough studies have been completed, a consensus will emerge. For instance, territoriality in most male birds is so well documented that it is treated as fact. That females tend to mate with the holders of the better territories is not so well established, but many ecologists think that it eventually will be.
A related problem is that there are more than 9,700 species of birds, and, as we know, they are a rather diverse lot. Suppose, for instance, we wished to know whether female birds prefer males that hold superior territories. Just determining whether females of one species in one habitat have that preference is not a simple task. The territories of males must be mapped and criteria to judge territorial quality must be found. For example, to compare territories within a population of insect eaters an ecologist may be required to do many careful censuses of insect abundance during the breeding season, without disturbing the breeding birds. Finally, of course, the female choices must be evaluated, most likely by counting the number of nests and the number of young fledged within each male's territory, often a difficult task in itself.
So much for finding the answer for one species in one locality -- how about other localities? And, since male birds of most species are territorial, what about other species? Obviously, it would be a mistake to generalize from the behavior of one population living in one habitat to all species of birds in all habitats. It would be necessary to see if female choices were made not only in a variety of species, but also in different habitats. If this were done, a pattern should emerge slowly, and with it an opportunity to draw tentative conclusions. Further studies may tend to confirm or refute those initial conclusions, and after enough studies have been completed, a consensus will emerge. For instance, territoriality in most male birds is so well documented that it is treated as fact. That females tend to mate with the holders of the better territories is not so well established, but many ecologists think that it eventually will be.
Free Birds Wallpapers Download
Free Birds Wallpapers Download
Free Birds Wallpapers Download
Free Birds Wallpapers Download
Free Birds Wallpapers Download
Free Birds Wallpapers Download
Free Birds Wallpapers Download
Free Birds Wallpapers Download
Vitalic - Birds
Flying Like A Bird | Part 14/14
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