bonnethead shark
A small species of hammerhead shark (Sphyrna tiburo) found in the Americas. In Japanese, it is a specific biological term, not a common everyday word.
See also: ウチワシュモクザメ
The bonnethead is a small species of hammerhead shark with a shovel-shaped head.
Loanword from English 'bonnethead', referring to the shark's distinctive head shape.