The largest dolphin is the “Killer Whale” known also as Orca and the most know dolphin is the bottlenose dolphin.
The flukes are two parts of the tail of a dolphin. All dolphins have a blowhole at the top where they breathe. Dolphins can stay up to 15 minutes under water, but they cannot breathe under the water.
The dolphin´s brain is similar in size to that of humans. Their brains are 4-5 times larger than those of other animals of similar size.
Dolphins detect prey and objects using their echolocation, that is, by interpreting the echo of sound waves bounced back by the target. Dolphins have an organ called melon in the head that emits the sound waves used for echolocation
They are social animals and can live in groups called pods than can have of members or even join with other groups creating superpods with thousands of individuals. The bonds between of a pod are very tight. They have been observed helping sick, alderly, and injured...