Since we are all taking a guess, I would say either a fox or a mink.  If it was a fox, they normally take some of their kills with them.  Perhaps the predator identification thread will help you? https://www.backyardchickens.com/forum/viewtopic.php?id=18670
I am sorry for your losses
		
	
	
		
			
		
		
	
				
			I am sorry for your losses
	
	
	
	
	
	
	