It's a mushroom cow, a passive creature. Mooshroom is a special creature in minecraft, and it is a unique cow generated in mushroom biota. They have red skin, black eyes and bodies covered with red mushrooms.

Passive creatures never attack players, most of them are livestock. They are generated on the surface and can be fed and copied by players; Mushrooms (mushroom cattle) have the same conditions as cattle, but can only be produced under the terrain of mushroom island; The formation of squid needs water; Bat generation needs darkness; Villagers were born with their villages. When the population of the villages is too small, they can reproduce themselves.