Dolphin intelligence continues puzzling scientists, and the result of the numerous tests and the extensive research made on the subject show an advanced capacity.
Studies that have been done to determine overall brain power put humans as #1 and dolphins as #2.
It is believed that dolphins follow similar types of humans patterns in their communication efforts.
There are many studies out there that compare the size of brains from one living thing to the next.
Dolphins sleep very different than most land mammals in a way that dolphins are not totally unconscious when they sleep