Note that this does not exist in Minecraft; it was written purely as a fiction article.
A Dolphin.
Dolphins are friendly passive mobs that live in deep bodies of water. They are a light blue with a white belly and a large tail fin. Like the Whale it cannot die if out of water but will not move.
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Dolphin
Behavior[]
If one encounters a Dolphin, the marine mammal will make clicking and whistling noises as a "hello". They are usually found in group and will attack sharks. If you hit them, they will tweet in a higher-pitched note and swim away. If there is a group nearby, they will also swim away, sort of reverse behavior when compared to wolves and zombie pigmen.
Habitat[]
Dolphins are found in deep bodies of water, otherwise sea biomes. It must be Y=65 or less in a volume of water in order to find one. Beware, this is also where Sharks are found.