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6.
Lunar and Seasonal Clocks
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6.3.
Annual and Seasonal Rhythms
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Most birds migrate at night, and migration is highly synchronized. This movie, made from images by US National Weather Service radars, shows how bird migration irrupts after sunset. The radar detected objects in the sky above New York during one migration night (Sept 11, 2010, 17:00 - 8:00). Compiled by Benjamin Van Doren, with kind permission © 2022 UCAR.
video/quicktime