Bird migration is the regular seasonal movement, often north and south along a flyway, between breeding and wintering grounds.
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Bird migration is the regular seasonal movement, often north and south along a flyway, between breeding and wintering grounds.
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Timing of Bird migration seems to be controlled primarily by changes in day length.
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Bird migration movements include those made in response to changes in food availability, habitat, or weather.
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Primary motivation for migration appears to be food; for example, some hummingbirds choose not to migrate if fed through the winter.
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Nocturnal migration can be monitored using weather radar data, allowing ornithologists to estimate the number of birds migrating on a given night, and the direction of the migration.
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Typical image of migration is of northern land birds, such as swallows and birds of prey, making long flights to the tropics.
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Some species of waders, Bird migration success depends on the availability of certain key food resources at stopover points along the Bird migration route.
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Seabird migration is similar in pattern to those of the waders and waterfowl.
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Bird migration is primarily, but not entirely, a Northern Hemisphere phenomenon.
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Apart from physiological adaptations, Bird migration sometimes requires behavioral changes such as flying in flocks to reduce the energy used in Bird migration or the risk of predation.
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Bird migration routes have been studied by a variety of techniques including the oldest, marking.
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An approach to identify Bird migration intensity makes use of upward pointing microphones to record the nocturnal contact calls of flocks flying overhead.
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An older technique developed by George Lowery and others to quantify migration involves observing the face of the full moon with a telescope and counting the silhouettes of flocks of birds as they fly at night.
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The distances involved in bird migration mean that they often cross political boundaries of countries and conservation measures require international cooperation.
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