egg looks like it's been open with a can opener

[Jesus Chick]

Can someone please tell me what can open an egg like a can opener, leave the shell but lick the shell clean! I have dogs and cats that help protect my chickens and peacocks so I can't imagine something being so bold as to come get some eggs. We have found a possum in our dog food but do they leave the shell if they get an egg? This is the 2nd time I've found one and this one was on my front porch!! I'm at a loss. My chickens are free range and lay in different spots and I don't believe these eggs were gotten out of the coup. Any suggestions?

 

[BantamFan4Life]

It could have been one of your hens, because sometimes hens will eat their eggs. Usually though, it will be cracked. The most likely thing it was, is a snake because they love to eat eggs. Is there snakes where you live?

 

[Jesus Chick]

I have experienced the chickens eating the eggs and they eat the entire egg. Also, the snakes take the whole egg. We put golf balls in the coop for the snakes, I've experienced that as well unfortunately. This is why I'm at such a loss. It looks like a perfect line across the egg making it like a lid that they opened and ate the egg. It's so strange. Do possums or skunks do that?