These giant reef fish bump heads — literally and violently . Scientists diving in the North Pacific were jarred when they heard mysterious sounds like spear guns being fired.

The mantis shrimp isn’t a mantis or a shrimp. The killdeer couldn’t. But the giant bumphead parrotfish… it’s a giant fish with a beak like a parrot and a bump on its head. Nice one ...

The dominant male, showing scale damage on back and side, is shown here following the head-butting bout. The giant bumphead parrotfish (Bolbometopon muricatum), which can reach 4 feet (1.3 meters ...

Ramming behavior among male bump-head parrot fish, which occurs during competition for females, has been observed by humans for the first time. Skip to main content. Scientific American.

In short: The fish is estimated to be more than two metres in length and was spotted on a beach near Victor Harbor. The SA Museum said it was "almost certainly a bump-head sunfish". What's next ...