Animal

The term Animal refers to a category of mobs and blocks that are based on real life animals and mythical animals. Mobs and blocks classified as animals include:

Breedable
Mobs that can be breed, majority of them are required for the Two by Two advancement with the Trader Llama only present in the The Parrots and the Bats advancement.

Tameable
Mobs that can be tamed and the Best Friends Forever advancements applies to them.
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Arthropod
The term Arthropod refers to an in-game classification regrouping all bug-like mobs that take extra damage and receive Slowness IV when hit with a weapon enchanted with Bane of Arthropods enchantment. Despite being animals, the majority of arthropods are considered monsters by the advancements, such as Monster Hunter and Monsters Hunted.

Unclassified
Mobs and blocks that are not in-game classified with advancements or enchantments, but were based on animals.