NPR

Sound Matters: Sex And Death In The Rain Forest

Scientists eavesdropping in trees have decoded a high stakes game of hide and seek. Katydids rely on ultrasound to find mates and listen for bats, which use ultrasound to find the bugs, and eat them.
A white-throated round-eared bat (<em>Tonatia silvicola</em>) catches — and munches — a katydid on Barro Colorado Island in Panama. Katydids are "the potato chips of the rain forest," scientists say.

A rain forest sings with the sounds of insects, birds, maybe a howler monkey or two. But scientists are discovering that some forest dwellers also communicate in ways humans usually can't hear — via ultrasound.

A team from Dartmouth College has recorded these signals in treetops on a pristine Panamanian island called Barro Colorado, and slowed them down to make sense of them.

The ultrasonic chatter, it turns out, is actually a complicated conversation between mating

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