Good luck on the hunting , eliminate every one . If they like your pond , and are content in the dens , I don't know how far they'll drag branches to store for this winters food . That or with entrances exposed , with low water , to den if they'll even stick around , but when rains finally come , they may remember what a wonderful home it was and return , I'd be eliminating the Bucktoothed Rats before they decide dam is too their liking .