My 8 week old chicks seem to not understand how to use the ramp. I don't think it's too steep, and even put a bucket on the ground to elevate it a bit. They just don't get it. Will they ever? I used a 1X10 piece of poplar with cedar shims as the "rungs" which are spaced 6 inches apart. For now I just put them up in their coop for the night. Any ideas?