Fish Can Do Math? Scientists Show Their Ability to Add and Subtract

Researchers in Germany have found that cichlids and stingrays are both able to recognize and calculate small quantities without really having to count them they say it's sort of like a person looking at their change on a table. 

Researchers in Germany have found that cichlids and stingrays are both able to recognize and calculate small quantities without really having to count them they say it’s sort of like a person looking at their change on a table.  It was discovered in a report that stingrays and a species of cichlid known as zebra mbuna have the ability to add and subtract.  During experiments, blue meant “add one” and yellow meant “subtract one.” the study authors showed each fish cards with shapes displaying either color and then presented them with two gates with different numbers of shapes — one of which was the correct mathematical answer.  If a fish saw three blue shapes, they would add one to three and swim through a gate displaying four shapes — gaining a food reward for answering correctly.