Most frogs emit a characteristic croak to attract the attention of a potential mate. But a few frog species that call near loud streams—where the noise may obscure those crucial love songs—add to their calls by visually showing off with the flap of a hand, a wave of a foot or a bob of the head. Frogs who “dance” near rushing streams have been documented in the rainforests of India, Borneo, Brazil and, now, Ecuador.
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Source: Phys.org