1.   Dolphins recognize the whistles of familiar animals, and are able to imitate the whistles of others.

2.   Previous studies suggested that dolphins recognized their own images, but the results were not considered conclusive.

3.   Q. Recently, it was reported that dolphins can recognize their image in the mirror.

4.   Bottlenose dolphins can recognize themselves in a mirror, an advanced intellectual ability observed previously only in humans and apes, a study finds.