One of these is not like the others

Upon quick glance, this looks like a normal dozen of eggs:

 From our lovely, albeit sqwuak-y, hens.

Until you look at the bottom green egg, second in from the left.  No?  Can't see it?  Look a bit closer...

GIGANTOR EGG!

 (That's not a real world.  I made it up.  But it sounded way cooler.  Like "gigantic" but with "or" on the end.)

This is GIGANTOR EGG compared to two normal eggs:

Apparently Athena, our "Easter-egger" hen, grew into a giant chicken overnight & began laying eggs the size of my hand.  We now have a chicken the size of a toddler stomping around the backyard & eating small pets that get too close.

Not really.  But wouldn't that make a good story?  "The Story of Athena, the Monster Chicken!"  We haven't cracked the GIGANTOR EGG, but we're fairly certain it's a double-yoker.  We kept an eye on her after the epic egg-laying, as we were worried it might have caused some damage & potential ensuing infection (even I cringed when I saw that egg - there's no way it didn't hurt when it popped out).  However, other than being extra hungry the next morning, she seemed to survive the whole ordeal.

I promise to post pics when we crack the egg.