You would find most common dolphins in warm water. If dolphins want to fight, they travel in packs. The worst enemy to the dolphin is the blue whale. Dolphins live in groups several hundred in the group is most common. All groups have a leader.
Dolphins help each other.
They watch out for their babies and save each other live. The rostrums are on their nose. It feels like cement. They use it to hit. The dolphins use their rotums to hit the shark's belly.