A shape-shifting flock of thousands of starlings, called a murmuration, is amazing to see. As many as 750,000 birds join together in flight. The birds spread out and come together. The flock splits ...
How high some birds fly at night depends on how brightly the Moon shines 1. The torpedo-shaped northern black swift (Cypseloides niger borealis) nests mainly in Colorado and winters in the Brazilian ...
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