For decades, scientists used a mirror experiment to explore whether animals could recognize themselves. In that test, ...

Looking at themselves in a mirror is enough to scare some fish, a new study finds. Fish looking at a mirror showed increased brain activity in regions linked to fear than fish faced with an actual ...

Even though a male cichlid is one tough fish, he may be scared of his own reflection. A new study shows that squaring off to fight a mirror opponent can be worse than fighting a real foe. Male cichlid ...

Fish become feisty but fearful when facing themselves in a mirror, according to two Stanford biologists. "It seems like something they don't understand," said Julie Desjardins, a post-doctoral ...

Learn how cleaner wrasse used a mirror and even dropped food to test their reflections, a behavior linked mostly to mammals. A small reef fish may be doing something scientists once thought was ...

Fish faced with their reflection in a mirror get aggressive, but also show an unexpected element of fear, which they don't show when fighting a real foe. The discovery raises the possibility that ...

Fish become feisty but fearful when facing themselves in a mirror, according to two Stanford biologists. "It seems like something they don't understand," said Julie Desjardins, a post-doctoral ...