For years, scientific divers at a research station in the Mediterranean Sea had a problem: at some point in every field ...

With more time, the fish may learn to pay attention to more subtle human features, such as hands or hair. According to the ...

One captive-bred species, archerfish, was able to recognize computer-generated images of human faces in lab experiments.

Wild fish participated as willing volunteers in the study. Many turned up every day to experimental trials, and scientists could recognize some fish by physical characteristics.