hi all, I just built my coop last week and moved my birds outside. Looks like this: It's got a ramp from the ground floor to the roost area: Over the past few days I've noticed that they seem to be able to come down the ramp, but never go back up. Is my ramp too steep? Are my 7 week old birds too young to know to go up to roost? Is there a way i can teach them?