Many frog species utter distinctive calls to lure mates. One group of neurons could help to explain the difference between two species.
Erik Zornik at Reed College in Portland, Oregon, and his colleagues studied the brains of two closely related species of African clawed frog: Xenopus laevis and Xenopus petersii. Males of both species emit fast trills while courting, but X. laevisproduces longer, lower-pitched trills than X. petersii.
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