Heard on All Things Considered. Symes decoded it for us: "So this really low, continuous sound is the sound of crickets," she explains. Biologist Sharon Martinson has tentatively named it Pycnopalpa sincordata. They apparently have neural circuits, she says, "related to recognizing certain signals as being important for being a mate or being a bat. And then the really high-pitched regular sound, is the sound of the bat flying through. Some types live in North America, but the variety is nothing compared to the or so species that live in Panama, where some behemoths are the size of a cell phone, and others are almost microscopic.
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