i have a single nesting box up from the ground about 2 feet with a hen and her chickies. when they're hungry, they just jump out of the box but the hen is bothered to get the chicks up again the nesting box when they are finished eating, i tried to make a ladder but the chicks ignore it. any ideas? i can't put the nesting box down, since there are wild rats around here. any ideas? how about making the ladder wider, or what?