Sometimes, it's good to hold a mirror up to yourself. But that's probably not the best advice for Simba, the feline star of an Instagram video that has recently gone viral. Simba was just born in ...

Cleaner wrasse have revealed a remarkable new side of fish intelligence. Marked with fake parasites, they used mirrors to inspect and remove the spots—far faster than seen in earlier tests. Even more ...

When you look in the mirror, what do you see? In all likelihood, you see a complex shape that you immediately recognize as yourself. Now, a team of researchers has found that mice appear capable of ...

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 ...