Despite the name, they're not slimy or mouldy. Slime mould is a single celled amoeba, found in soils around the world.
But when times get hard, these simple cells join together to form a new slug-like creature. In a strange example of social altruism, some cells commit suicide allowing others to reproduce.
Quentin Cooper finds out more about slime mould from Dr Chris Thompson from the University of Manchester.
Prof Adrian Harwood from Cardiff University explains how these simple creatures could be used to improve drugs for manic depression.