Cute Birds Wallpaper Biography
Precise information on the longevity of birds is not easy to come by. It is usually impossible to follow large groups of individuals from hatching to death, so in addition to collecting data directly by banding and recapturing individuals, many indirect methods of estimating age are used. Generally, it appears that the heaviest post-fledging mortality occurs among inexperienced young birds, and that for adults, after they have successfully reared young, the probability of death each year remains roughly constant. In other words, few birds die of "old age -- they just run the same gamut of risks year in and year out until they are killed. The annual risk of being killed varies from about 70 percent in small temperate-zone songbirds (adult life expectancy about 10 months; in the tropics adult songbirds are thought to be much longer-lived) to 3 percent in Royal Albatrosses (fife expectancy slightly over 30 years). If a bird lasts long enough, however, the probability of it dying in a given year may once again rise. Common Terns reach old age after about 19 years, and their annual risk of dying then goes up.
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Precise information on the longevity of birds is not easy to come by. It is usually impossible to follow large groups of individuals from hatching to death, so in addition to collecting data directly by banding and recapturing individuals, many indirect methods of estimating age are used. Generally, it appears that the heaviest post-fledging mortality occurs among inexperienced young birds, and that for adults, after they have successfully reared young, the probability of death each year remains roughly constant. In other words, few birds die of "old age -- they just run the same gamut of risks year in and year out until they are killed. The annual risk of being killed varies from about 70 percent in small temperate-zone songbirds (adult life expectancy about 10 months; in the tropics adult songbirds are thought to be much longer-lived) to 3 percent in Royal Albatrosses (fife expectancy slightly over 30 years). If a bird lasts long enough, however, the probability of it dying in a given year may once again rise. Common Terns reach old age after about 19 years, and their annual risk of dying then goes up.
Cute Birds Wallpaper
Cute Birds Wallpaper
Cute Birds Wallpaper
Cute Birds Wallpaper
Cute Birds Wallpaper
Cute Birds Wallpaper
Cute Birds Wallpaper
Cute Birds Wallpaper
Funny Animal Attacks
El Ganso asesino I
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