They squeak, squawk and use body language—leaping as high as.. A dolphin is any one of the 40 extant species of aquatic mammal from the cetacean families delphinidae (the oceanic dolphins), platanistidae (the indian river dolphins), iniidae (the new world river.
Dolphins are some of the most intelligent marine mammals.. Thought to be some of the smartest animals on earth, bottlenose dolphins send messages to one another in many different ways.