I'm trying to find something...I have a large door that I can enter the run from. I let the chicks in and out of this door, sometimes propping it open during the day. I'd like to build something that let's the chicks easily enter and leave the run that won't let my kids or coyotes in. I was thinking some sort of small ramp system, similar to the door going from the run to the coop. Any ideas or pics?