skua

例句：

1. 1. The seagulls are flying overhead in the sky.
   海鸥在空中飞翔。
2. 2. The terns are diving into the water to catch fish.
   海燕正在潜入水中捕鱼。
3. 3. A heron is standing on a rock, watching for prey.
   一只鹤站在岩石上，观察猎物。