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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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