Those Dasypeltis are stretchy !!! It is amazing how much a lifestyle or preferred prey can mold an animal morphologically. From losing teeth to evolving the vertebral spine to break the egg. In Carl Kauffeld's book, Snakes: The Keeper and the Kept,he wrote of a Pituophis he had as a youngster that would eat chicken eggs in similar fashion, although it would swallow the shell too. Thanks for posting that link.
Cause when push comes to shove you taste what you're made of
You might bend, till you break cause its all you can take
On your knees you look up decide you've had enough
You get mad you get strong wipe your hands shake it off
Then you Stand