I have 4 silkies that are 20 weeks old. Pretty much all our other breeds like to roost at night but the silkies seem to prefer snuggling together on the bedding. Is this a permanent preference or do they just start roosting later than other breeds? We are wanting to get them outside in a chicken tractor and are wondering if we need to build a little shelf for them to sleep on or be out of the wet... What do you Silkie pro's think? THis is our first experience with them and are not sure what to expect with them. Any input on the chicken tractor idea would be welcome.