Have you ever seen a fish walk? Climb a tree? Survive on land? Well, that's exactly what the climbing perch fish is able to do.
It can survive for days out of water because they have an organ a bit like a lung.
The fish normally live in waters near Papua New Guinea, an island just north of Australia.
But now they've been spotted near the coast of Australia, which scientists say is not good news.
Watch Martin's report to find out more...