You progress through the tunnel, noting that there seems to be more and more of the tiny crawling things the further you go.
After a while you start feeling the horrible smell again, and shortly thereafter you come upon another large cavern. A dozen of the fat, big-eared beasts are sitting on the floor eating crawlers. Two tunnels lead from this cavern: one straight ahead, and one to the right. Suddenly, without any noticeable cause, all the fat beasts scramble to their feet and toddle towards the right tunnel, squealing.
Remus: Harry... I'm a werewolf.
Harry: Are you fucking serious?
Remus: Well yes, but I don't see how that applies here.