Ornate tadpoles are the first ever documented vertebrate larva to communicate using sound. Now they think that there could many others that also use sound as larva. Video included in the link. It's basically the tadpole version of Daryl's video of his ornate frog sounding off when prodded.. Very cool indeed.
http://news.bbc.co.uk/earth/hi/earth...00/8609235.stm
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