A clever tropical fish has flipped how biologists are thinking about memory, brains and visual recognition in the animal kingdom. Here’s how.

Most assume that cold water is deadly for fish. The truth is, nature has incredible exceptions. In polar oceans and snowy lakes where temperatures hov.

Fish are among the most unique and fascinating groups of animals that can be found swimming and inhabiting both freshwater and saltwater habitats alike. With tens of thousands of fish species and a ...