One of the most difficult skills to pick up as a birder is how to identify birds in flight. You have to sort through a series of visual clues all at once, at high speed: silhouette, wing shape, how fast it flaps, and patterning. An experienced birder will take in all these and other clues that are hard to put into words. So if you hang around long enough, you might hear some interesting slang.

More info and transcript at BirdNote.org. 

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