Lair (The Rats Trilogy)

The mutant white rat had grown and mated, creating offspring in its own image. They dominated the others, the dark-furred ones, who foraged for food and brought it back to the Lair. The dark rats were restless, tormented by a craving they could not satisfy—but the white slug-like thing that ruled them knew. Its two heads weaved to and fro, and a stickiness drooled from its mouth, as it remembered the taste of human flesh.