"You're going to meet Janet, the Weevil," Ianto said, as the went down the stairs and rounded the corner of a tunnel. "And probably...well, we don't have a name for it yet, but there's a Hoix a few cells down that would probably be pretty interesting to you as well. As for what a Weevil exactly is, well. You'll see when we get there, but basically, Weevils are big, mildly telepathic pitbull-like humanoids that can digest anything they run into. They generally live in the sewers and keep to themselves, but Janet here likes to attack people, so we keep her locked up. As for Hoix, well, they're kind of uglier versions of weevils, only their only goal in life it seems is to eat anything. Metal, plastic, you, you name it. I had to remove anything in the cell that might've gotten eaten off."