The name dolphin perhaps come from the Greek Delphis, whe means or “uterus” since the dolphins give birth to their babies, or in an other translation of Delphis it can mean “spirit of the sea”!….for me both can match with my idea of Dolphins!
In Greek mythology, the dolphin is an animal beloved by Apollo. Friend of man, kind with children, liking music, sailors’s comrade that announce calm waters and safe routes, he is a help for fishermen. His capture was a sacrilege.
The dolphins are the only ones, among the non-human mammals, that can be attributed a proper name. In social group, the members recognize themselves by their “speech”: every individual corresponds a special vocalization, a sound that in their very intelligent mind is a real name.
The dolphin is the only animal, besides humans, to have in the midbrain the “black substance”, which indicates a high intellectual development. If captured he feels anxiety. For an affective pain, as in the case of a mother separated from her baby, she can suicide, voluntarily stopping to breathe.
Dolphins can realize that they do not know something. In one experiment, some students were rewarding the animals only if they answered correctly but they were allowed not to complete the test to think it over. The “do not know” option was often chosen by a dolphin. For the searchers, their behavior in face of doubts is similar to what humans feel in similar situations.
The dolphin emits with the head some high-frequency sounds (called click) that spread in the water and then come back in the form of echo. Like that they are able to navigate and locate objects and bodies in the water (so they can, for example, find a coin up to 80 meters and a shoal of small fishes to more than 100 meters).