Zebra mbuna (a species of cichlid fish) and stingrays can add and ... could be trained to recognise the colour blue as a symbol for addition by a factor of one and the colour yellow as a symbol ...

Many of the blue fish were zebra striped, while one of the yellow varieties had horizontal streaks of black and white. The rocky lakebed was like a collapsed cathedral. The cichlids, mostly two to ...

Eight of the fish were freshwater stingrays and the others were a species of cichlid known as zebra mbuna. During the experiments, blue meant “add one” and yellow meant “subtract one.” ...

Officials shared a photo of the exotic fish, with its neon blue and orange coloring and dark zebra stripe pattern running along its body. While there are different species of cichlids, the peacock ...