You see the dolphins down at Sea World jumping and swimming around by command. Fact is that dolphins and humans cannot communicate with each other.
Dolphins are very playful, curious creatures.
Therefore, they are easy to train for shows such as Sea World and other attractions. Communication between dolphins and humans is very difficult for a number of reasons. First of all, humans have a different language than dolphins. Dolphins also do not have vocal cords. Another problem is that dolphins do not have facial expressions.