Fennec foxes occupy a permanent den, which they dig themselves. Their burrowing activity may also trigger the formation of dew, which can be lapped up. They appear to be relatively social, living in family groups in some areas, although the core structure of this colonial living is the breeding pair. They can move quite rapidly, and are able to jump distances of 4 feet or more. They bark like a small dog, but also make a purring sound like a domestic cat. If threatened, they will snarl.