スミソニアン国立動物園さんのインスタグラム写真 - (スミソニアン国立動物園Instagram)「🤔👀 Take a close look at these two casts in the shape of great ape hands. Which one belongs to a gorilla, and which to an orangutan? (Hint: gorillas are mainly terrestrial, or ground-dwelling, apes; orangutans are mostly arboreal, or tree-dwelling, apes.) 🦍 🐵 🦍 🐵 🦍 🐵 The gorilla hand cast is on the left, and the orangutan hand cast is on the right. Orangutans have long fingers—an adaptation that allows them to swing through the trees with ease!」9月4日 2時13分