noun, noun which may take the genitive case particle 'no'
beasts; mammals
Zoological term for mammals or beasts; often used in scientific or formal contexts.
I am researching the ecology of mammals.
Many beasts inhabit this region.
holotherians
prototherians
metatherians
eutherians; placental mammals
Compound of 獣 (beast) and 類 (kind, category). The exact historical derivation is uncertain, but the spelling is conventionally associated with the meaning 'mammals' or 'beasts'.