Most convenient timing for the critter and trap to exit stage right out of view ... Our four legged traps bring whatever they can find alive into the house, then ... Let it go! Let it go! Here's my prize for you. Catch it now. GO! Sigh. Sure keeps the two legged inhabitants on their toes and figuring out ways to improvise and trap mice, chipmunks, birds, ... expediently, before 1 rodent and 4 cats turn the house into cirque de souris. Climbing curtains. Knocking over vases. Etc.