Dolphins also do not have vocal cords. Another problem is that dolphins do not have facial expressions. We cannot tell when they are happy or angry. You can tell when some one is angry by their expression or if a dog is happy, he wags his tail. Dolphins, however, always have the same smiling snout.
Dolphins live in groups.
Like humans, dolphins are attached to each other and live together as a family. This provides safety and shelter. Dolphins communicate by making two types of sounds. They are known as vocalization and echolocation. The difference between the two is that vocalization is made up of the many noises that dolphins use to communicate.