They are clever little monsters. & there are over 300 species around the world! Don't move too much around... if they detect changes they avoid the area & move to a different area of your housing. Use fresh yummy bait each night but dont move things around. Cover feed & water or empty them but don't move them.Ugghhh! I think the trick is put the trap in the rats ‘path’ take all the food and water away so that the rats hungry for the bait. Maybe put a crate or something on the top to make it feel more secure?