noun
marsupial
Zoological term for mammals that carry their young in a pouch, such as kangaroos and koalas.
カンガルーは有袋動物の一種です。
Kangaroos are a type of marsupial.
哺乳類 is the broader class of mammals, while 有袋動物 specifically refers to the infraclass Marsupialia.
Compound of 有袋 (yūtai, 'having a pouch') + 動物 (dōbutsu, 'animal'). The term is a direct calque of the taxonomic concept.