Great News!!!! They are 5 1/2 weeks old and all 25 of them have finally figured it out yay! We spent several weeks "helping" them find the ramp then go all the way up, then about 1/2 of them figured it out and I assumed the rest would just follow the others in - not so much. We still consistently had 6 or 7 that would just cry until we helped them. Then 3 nights ago they all went in on their own and have every night since. I can't tell you how happy this makes me.