This is exactly how I found one of my duck hens, just was to surprised to make a picture.  I figured he was waiting for a warm egg.
https://www.chron.com/entertainment...-thieving-snake-leaving-both-the-13177179.php
	
		
			
		
		
	
				
			https://www.chron.com/entertainment...-thieving-snake-leaving-both-the-13177179.php
	
.  Didn't know you had rat snakes on the left coast.