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Migration: Traveling to Find Food and Warmth Many birds migrate long distances to find food during winter months. The Ruby-throated Hummingbird (Archilochus colubris) beats its wings at a rate of 40 to 80 beats per seco
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Document Date: 2013-09-21 10:03:31
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Migration: Traveling to Find Food and Warmth Many birds migrate long distances to find food during winter months. The Ruby-throated Hummingbird (Archilochus colubris) beats its wings at a rate of 40 to 80 beats per seco