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)「🤔💬 What quoth the raven? Ravens are very communicative and have been recorded producing more than 30 vocalizations! In human care, they can mimic simple sounds – even human speech. 👋 Celebrate #NationalRavenDay with a visit to American Trail to see our resident ravens, Iris and Chogan! . . . 📷 Photo: A raven stands in profile, its beak agape. The sun is shining on its black feathers, giving them an iridescent sheen.」4月28日 2時59分