Dolphins are relatively small cetaceans, with a total of 62 species  Dolphins are generally 1 2 to 10 meters long and weigh 45 to 9,000 kilograms in the major oceans of the world  They mainly feed on small fish, squid, shrimp and crabs They like to live as a group, as few as a few or hundreds
The dolphin is an excellent and clever marine mammal
Some intelligent mammals live in the sea