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雅思阅读真题精选:orientatinofbirds

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雅思阅读真题精选:orientatinofbirds

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雅思阅读真题精选:orientatin of birds

Migration of Birds

Orientation andNavigation

A .Factors in a birdsenvironment select for the eXpression

of migratory behavior, leading to theevolution of a migratory

pattern or, on the other hand, to the loss ofmigratory

s in the environment function to provide

direct,proXimal stimulation for the physiological preparation

for sin the environment also provide

information that allows birds to navigateduring migratory

tion requires knowing three things:

currentlocation, destination, and the direction to travel to

get from the currentlocation to the

eventually learned to use both the sun andthe stars to obtain

this ly we invented more

precisesatellite-based technologies that have made these

celestial cues fordetermining geographic positions

superfluous and developed electronic aids tonavigation that

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