CEDICT
koala (a tree-dwelling marsupial that resembles a small bear)
Wiktionary
一種有袋類動物（Phascolarctoscinereus），原產於澳洲，主要以桉樹葉為食。
維基詞典
classifier: 棵
Koala bears do not have belly buttons.
Source: Tatoeba
Have you ever seen a koala?