Shark!

[Aliantha]

Conflicting advice on Wiki says they're solitary hunters. Interesting reading though if you're interested.

Bull sharks are solitary hunters.[5] They often cruise through shallow waters. They can suddenly burst into speed and can be highly aggressive, even attacking a racehorse in the Brisbane River in the Australian state of Queensland.[3] They are extremely territorial and will attack other animals – including humans – that enter their territory. Along with the great white, tiger and oceanic whitetip sharks, bull sharks are among the four species considered the most dangerous to humans, and is probably the most dangerous of the four species. One or more bull sharks are most likely responsible for the Jersey Shore shark attacks of 1916 that were originally attributed to a great white, and which inspired the movie Jaws.[10].

Many experts think the bull shark is responsible for most of the deaths around the Sydney Harbour inlets in the past.[citation needed] Most of these attacks were previously thought to be great whites. In India the bull shark cruises up the Ganges River where it has killed and attacked a large number of people. It also eats the corpses that the Indians float on the river. Many of these attacks have been wrongly blamed on the Ganges shark, Glyphis gangeticus,[citation needed] a fairly rare species that is probably the only other shark that can live comfortably in both saltwater and freshwater. The grey nurse shark was also blamed in the sixties and seventies.

[Elspode]

I can see the next political slogan Down Under: "A shrimp on every barbie, a shark in every rental trailer!"