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为了帮助大家在备考雅思的时候能够练习到更多的真题材料，下面小编给大家带来雅思阅读真题精选:orientatin of birds，望喜欢！
雅思阅读真题精选:orientatin of birds
Migration of Birds
Orientation andNavigation
A .Factors in a bird'senvironment select for the expression of migratory behavior, leading to theevolution of a migratory pattern or, on the other hand, to the loss ofmigratory abilities. Factors in the environment function to provide direct,proximal stimulation for the physiological preparation for migration. Factorsin the environment also provide information that allows birds to navigateduring migratory passage. Navigation requires knowing three things: currentlocation, destination, and the direction to travel to get from the currentlocation to the destination. Humans eventually learned to use both the sun andthe stars to obtain this information. Recently we invented more precisesatellite-based technologies that have made these celestial cues fordetermining geographic positions superfluous and developed electronic aids tonavigation that allow orientation without reference to the natural environment.Birds have successfully navigated for eons using environmental information.
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