Niffler

‘The Niffler is a British beast. Fluffy, black and long-snouted, this burrowing creature has a predilection for anything glittery. Nifflers are often kept by goblins to burrow deep into the earth for treasure. Though the Niffler is gentle and even affectionate, it can be destructive to belongings and should never be kept in a house.’

Newt Scamander, Fantastic Beasts and Where to Find Them