My girlfriend raises Silkies, her setup is like a series of shelves and ladders, her silkies all roost this way, her bigger birds like the Lavendar Orp head to the top rungs/shelves.  they never slept on the ground since there is always a place they can reach to roost for the night.  Maybe they just can't reach any of the bars/places to perch?
	
		
			
		
		
	
				
			
	
