noun
thresher shark; common thresher shark
Refers to thresher sharks, especially the common thresher shark (Alopias vulpinus). The name comes from its long tail fin.
オナガザメは長い尾で小魚を捕まえる。
The thresher shark catches small fish with its long tail.
From 尾長 (onaga, 'long tail') + 鮫 (same, 'shark'), referring to the shark's elongated upper tail fin.