Sleeping issue- My two cayuga ducklings are 3 days away from being exactly 6 weeks old. Their entire underside is covered in adult feathers and there wings are mostly covered. I usually put them outside until the sun goes down and then bring them in and let them sleep in a large box in my garage where it is warmer than outside. I am afraid to put them outside and get them too cold. Is it okay to let them sleep outside in a shelter like a doghouse or are they too young? I am in LOVE with my two baby drakes <3 i don't want anything bad to happen to them. Feed issue- they are still on starter mash when do I switch to the next level of feed and what is it called?