Barking Piranhas

National Geographic writes, "Piranhas, it turns out, can be excellent communicators, a new study suggests. But don't get the idea they're going soft — their barks, croaks, and clicks likely mean 'leave me alone,' 'I might bite you,' or 'now I'm really angry!' "

http://news.nationalgeographic.com/news/2011/10/111012-piranhas-bark-science-get-away/

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