Hi! I am wondering how you all encourage your ducks to return to their pen for the night. I absolutely could not chase 3 ducks around the yard to get them in the pen, and we definitely need to have them penned. Do you feed them in the pen at the end of the evening? Do they come in on their own? Also, can ducks walk up a ramp to get into a pen? We are trying to design our pen right now and are thinking of making it up off the ground for cleanliness, but am not sure how high up it should be (maybe 2 feet?) and whether the ducks would be able to walk up a ramp to get to it? Thanks!