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by Jon Dunn. Copyright 2021. Available from Basic Books, an imprint of Hachette Book Group, Inc.
The monochrome jacobins that whirred and buzzed and jousted around me had a claim to fame that I would have to accept at its word, for it was one that I could neither see nor, in particular, hear for myself. I had come to the Brazilian forest armed with little more equipment than my binoculars and camera.
This was widely reported as black jacobins uttering the highest-pitched calls of any bird in the entire world. That was not strictly true, as Mello’s paper describing the black jacobins’ calls was careful to point out—that accolade appeared to belong to another hummingbird, the blue-throated hummingbird, whose song included elements that exceeded a mighty twenty kilohertz.
While black jacobins had elected to shout very loudly to catch one another’s attention, another hummingbird species had evolved to let their feathers do the talking.
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