Audubon Society of Portland's School of Birding is a series of classes and field trips helping people discover the art of birding in the Pacific Northwest.
This is an amazing video, showing in super slow-motion exactly how hummingbirds make diving sounds with their tails. Really cool!
"During the mating season, male hummingbirds climb high into the air and then nose-dive, belting out sharp squeaks or trills to impress watching females. A new study shows how the tiny birds emit their high-pitched calls."
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