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!' "

Load Comments...

Send this Article to a Friend

Separate multiple emails with a comma (,); limit 5 recipients

Your email has been sent successfully!

Manage this Video in Your Playlists

notify when someone comments

This website uses cookies.

This website uses cookies to improve user experience. By using this website you consent to all cookies in accordance with our Privacy Policy.

I agree
Learn More