The whales join a small but growing group of animals, including great apes, magpies, and cleaner wrasse fish, who share "this ...

The mirror test focuses on visual cues; however, there is no reason to think that other animals only use vision to make some assessments of self. The results of studies of self-recognition are a mixed ...

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. A cat recognizing a fellow feline's reflection has been dubbed as one ...

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 ...