This fish may play a hole in its head like a drum

The rockhead poacher's mysterious head pit may be an instrument rising above a noisy habitat

A brownish rockhead poacher fish sidles up against an underwater rock

The rockhead poacher (one shown) has a big pit in the top of its head, seen here as a large, tan depression. The structure may act like a drum for communication with other poachers.

Mike Kelly

This is a human-written story voiced by AI.