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logo 11/27/2024 1:41:19 PM     
Cichlids and stingrays can add and subtract ‘one’ in the number space from one to five 
By V. Schluessel, N. Kreuter, I. M. Gosemann & E. Schmidt US Source: nature 3/31/2022

The numerical understanding of cichlids and stingrays was examined regarding addition and subtraction abilities within the number space of one to five. Experiments were conducted as two-alternative forced-choice experiments, using a delayed matching to sample technique.
 

On each trial, fish had to perform either an addition or subtraction, based on the presentation of two-dimensional objects in two distinct colors, with the color signaling a particular arithmetic process. Six cichlids and four stingrays successfully completed training and recognized specific colors as symbols for addition and subtraction.

 
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