Some hummingbirds hit notes so high, only a dog could hear them


Green hummingbird hovers next to purple flowers with green background.
Animals

Shaking up what we know about bird hearing.

Some can hit notes so high, they go ultrasonic. But based on everything we know about birds, the hummingbirds shouldn’t be able to hear notes that high.
via Popular Science "https://ift.tt/2CoSNnX"

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