i agree .. chickens have 'good' memory and will pass that down to, if a bad incident occured in the coop you will have hard time overcoming that, food is your best leverage .. you wont get rid of night time predators ever but you could certainly get rid of problem critters that have made it a nightly routine to hang out at your coop .. best setup is a flashlight with adjustable spot taped to a 12 gauge and some #6 .. pattern it and adjust it at dusk so the shot c loud is dead on the flashlight spot at about 20 ft ... then you got to figure out what time your problem critter is prowling around .. i'd bait it in front of a nice backstop like a pile of wood or dirt and you got to go out at different times 'very' quietly throughout the night until you catch them in the act lol .. when you detect it bang the light on and let him have it ..