Their bold personality and vivid colors make them a lively addition to any tank. The Moorish Idol is a striking marine fish ...

Those ones have yellow spots with black centers ... of the most intelligent species of freshwater fish, and many of them reorganize their tank. It's like feng shui for fish.

The fish or stingrays entered an experimental arena where they saw a test stimulus: a card showing a set of geometric shapes (square, circle, triangle) in either yellow or blue. In a separate ...