ScienceDaily Posted March 5, 2018 Share Posted March 5, 2018 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. Read the full article on ScienceDaily Link to comment Share on other sites More sharing options...
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