although they are found everywhere in the world, the vast majority of species are native to, and reside in, south america, as they have a predilection for muddy rivers, lakes and tropical beaches - they are most commonly found in fast-flowing rivers and streams, but have adapted over the years to inhabit shallow salt-waters, while some species take shelter underground or in caves.

they tend to be omnivores - feeding predominantly on fish, insects, worms, frogs and newts - there are thought to be at least 3,000 different species of catfish, but their current conservational status is under threat.