This AM in my suburban yard watched one large (3+ feet) Black Rat Snake lying on another for 5 minutes with little movement. Assume they were mating. Short time later one moved toward compost pile and discovered a dead chipmunk that smelled bad covered with flies. Snake began to swallow it head first while moving deeper into heap of cuttings on pile. I believe it was hiding itself to digest this large meal once he had it down. Soon he was out of sight with only a swarm of disappointed blow flies to mark his position. His/her mate appeared and closely checked what was going on but slithered away likely because first snake had much of the prize down it's throat. Both were healthy snakes, same size. I see them often in the yard where there is a long natural stone wall where they hunt and take cover.