This Hummingbird Makes the Highest-Pitched Call Of Any Bird - [Wed, 07 Mar 2018 19:14:01 GMT ] The black Jacobin emits a shrill noise that sounds more like a frog or a cricket, leaving scientists puzzled.

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1	This Hummingbird Makes the Highest-Pitched Call Of Any Bird - [Wed, 07 Mar 2018 19:14:01 GMT ] The black Jacobin emits a shrill noise that sounds more like a frog or a cricket, leaving scientists puzzled. (This link leads to the external institution page)	National Geographic Society	United States-USA	Washington	2019-08-01