Mosquito fish count comrades to stay alive

Study finds signs of a basic number sense that may aid survival in the wild

10:25am, June 19, 2009

Mosquito fish don’t just count on each other for protection from predators — they literally count each other for such protection. These guppylike fish can use numerical information to identify the larger of two nearby groups of fellow fish, report psychologist Marco Dadda of the University of Padova in Italy and his colleagues in an upcoming Cognition.

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