sooty tern

sooty-tern的词性：
n.（名词）

1. A tern (Sterna fuscata) found along most tropical coasts, having black plumage above and white below. Also called wide-awake
乌燕鸥：生存于大部分热带海岸的一种（乌燕鸡） ，背上羽毛为黑色，腹部羽毛为白色 也作 wide-awake