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Black Jacobin - Sciences, Education, Art, Writing, UFO - Posted: 7th Mar, 2018 - 4:30pm
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Humming bird
Post Date: 7th Mar, 2018 - 4:30pm / Post ID: #
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Black Jacobin
These tropical hummingbirds make cricket-like sounds other birds can't hear. Researchers have found that a tropical species of hummingbird called a black jacobin makes vocal sounds with an unusually high-frequency pitch that falls outside birds' normal hearing range. It's not yet clear whether the hummingbirds can even hear themselves, the researchers say. Source 4h.
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