The black Jacobin hummingbird has a song that is so high-pitched that it can't be heard by humans, according to findings published in Current Biology. Researchers came across the unusual species during a visit to the Atlantic Forest in Brazil, where there had been sightings of a black hummingbird that appeared to be singing but couldn't be heard by observers.
Humans can't hear black hummingbird's high-pitched song
Sign up for Sigma Xi SmartBrief
News on scientific research and innovation
Get the intelligence you need: news and information that is changing your industry today, hand-curated by our professional editors from thousands of sources and delivered straight to your inbox.