Rivalry shocked everyone.

Learn how cleaner wrasse used a mirror and even dropped food to test their reflections, a behavior linked mostly to mammals.

I wake up in the morning and look in the mirror. I shower and do my hair and makeup in front of a vanity mirror, then get dressed with the help of my full-length mirror. I have three mirrors in my ...

Humans like to study themselves in a mirror. But wild baboons, when presented with a mirror, don’t seem to recognize they’re staring at their own selves, a new study has found. For decades, ...