One of the Dead Eels apparently trained some white rats to come to this side of the canal and fetch shiny objects back to him. So far they've taken a few coins and a couple of bullets back over into Eel territory. Pike saw one carrying a coin and tried to shoot it, but his marksmanship is lacking, hah! Be wary of them, and crush the little things if you get the chance. If one swipes one of [the] tools or keys or something like that you'll be a laughingstock.