Animal

An Animal is an in-game category of mobs and blocks that are based on real life animals and mythical animals. Mobs and blocks classified as animals include:

Amphibians and Reptiles
Amphibians and reptiles are groups of warm-blooded vertebrates.

Arthropods
Arthropods are a group of invertebrate animals having an exoskeleton.

Birds
Birds are a group of warm-blooded feathered vertebrates.

Cnidarians, Echinoderms and Poriferas
Cnidarians, echinoderms and poriferas are groups of invertebrate aquatic animals.

Fish
Fishes are a group of aquatic vertebrates that have gills.

Mammals
Mammals are a group of vertebrates that have mammary glands.
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Mollusks
Mollusks are a group of invertebrate animals that have a mantle sed for breathing.

Unclassified
These mobs are classified as animals but have a unknown animal classification, presumably mammals.