Mutual help
Very often dolphins helped ships to get through dangerous areas of sea. And thanks to it many monuments in thousands of countries were put to honour these creatures. One monument was put in New Zealand to honour the dolphin that helped ships to pass through strait clutched by rocks. This dolphin was helping the ships during 20 years. And this fact was officially registered.
Dolphins were the first to find the contact with people. They even allowed people to capture them. And being captured they don't try to escape, and sometimes it seems that they are doing it on purpose, so that people could study them better.
And maybe dolphins will change our life, making us more polite, kinder and more attentive to each other.
Sometimes dolphins need help too. There are so many examples when dolphins were beached during storms. And people were helping dolphins to get back to the sea. But dolphins always said "thank you" to people getting back to the seashore.
People took care of dolphins if they were hurt. And they take care of them till they are completely healthy. After the treatment some dolphins don't want to leave people. And then they are put to dolphinarium where they are taught to do various tricks.
In such way there is always mutual help and respect between dolphins and people.