Our two Khaki Campbell ducklings are about a six weeks old. We have a duck house with a ramp going into it, that the other 4 ducks learned to go in and out of fairly easily. These two just don't seem to be able to understand the concept of going up the ramp and into the house for safety. We have tried making a funnel of coolers (like we did with the other ducks) to show them where to go, actually putting them on the ramp to get them to go in and out, having the other ducks lead them in, and I even got inside the coop today again to show them how to go in and out, but they don't seem to get it. Thought at first they were avoiding going in with the "old" flock, but even with the other ducks in a separate pen and me putting them on the ramp, it doesn't seem to take. Have put food and water inside the house and they still will not go inside without being shown how to get in. With the first group of ducks, after a couple attempts showing them how to get inside, once it started to get dusk, they would go in on their own. They are a little younger than when we introduced the first group to the house, could that be the problem? Any suggestions? The first group learning to use the ramp - that was easy!