There are many studies out there that compare the size of brains from one living thing to the next.
Adult bottlenose dolphins range from two to four meters or six to thirteen feet.
The hole on the top of the dolphin is the blowhole. Dolphins breathe through their blowhole.
People sometimes use the word dolphin and porpoise interchangeably. However this is a mistake, as dolphins and porpoises are in fact different animals.
The bottlenose dolphin is probably one of the best known species of dolphins. Bottlenose dolphins are around eight to nine feet long and they have streamlined body with a large fin at the top