Here is a link to a very interesting internal layer post here on BYC with pictures.  I guess it could be graphic for some but maybe it will help.  This is a chicken but I am sure it's close to the same thing. 
https://www.backyardchickens.com/forum/viewtopic.php?id=186940
	
		
			
		
		
	
				
			https://www.backyardchickens.com/forum/viewtopic.php?id=186940
 
	 
 
		 
 
		 
	 
	 
 
		 
 
		 
 
		
 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		