Fish can count to four – but no higher

Posted on March 1, 2008 

Fish can count to four – but no higher

Fish can count, according to scientists, who have found that North American mosquito fish have the ability to count up to four.

Previously it was known that fish could tell big shoals from small ones, but researchers have now found that they have a limited ability to count how many other fish are nearby.

A second series of experiments revealed the fish’s ability to process larger numbers. The fish were not able to directly count over four, but they were able to distinguish between larger numbers if they differed by a ratio of 2:1.

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