The dolphin is a neutral creature that lives in any sea or ocean in the game, as long as it is not frozen. Although dolphins do not attack, if they are hit they will attack in a pod. They can die from being out of the water too long, but also from being in the water too long, as they need to breathe.
Dolphins always swim in groups and jump out of the water to get air and play. Often, we will see dolphins chasing boat players, although they will not attack them, they are just chasing them. If a dolphin leaves the water, it will suffocate and die within two minutes of being out of the water. They also need to breathe, so if in about four minutes they cannot get out of the water to breathe, they will die.
Dolphins are neutral, meaning they will not attack anyone. However, if a player attacks a dolphin, they will attack in a pack, just as wolves or Zombie Pigman do, since dolphins never swim alone. Although they do not attack anyone, dolphins run away from Guardians and Elder Guardians.
The dolphin is not a creature that can be tamed, however, if a player feeds them raw cod or raw salmon, their confidence with playing will increase and their interaction with the player will increase. In addition, once fed they will swim towards the nearest shipwreck or underwater ruins closest to their position.
Dolphins are generated only in oceanic biomes, except in frozen oceans. Whenever they generate, they do so in groups of 3 to 5 individuals. Like squids, dolphins reproduce naturally, provided the conditions are right for this to happen.
If you like this creature and in addition to details you want to get its face to make crafts or as a profile of social networks and forums, here is the Minecraft Dolphin Face. You can download and print it.