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Environment

Piranha not only bite but also bark

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Dec. 9 - Belgian scientists have discovered that the fearsome South American piranha barks as well as bites, when it hunts. They say they carnivorous fish makes different kinds of barking noises to mark different stages of aggression, a discovery that might apply to other fish species and help to monitor breeding patterns and marine populations. Joanne Nicholson reports.

Environment

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