A Fart Egg?

Raising chickens has been quite an adventure.  We've learned (though experience) how our chickens were escaping from our backyard,  how to clip their wings, that they don't get seriously sick every fall (they  just molt), and that every once in awhile, they may lay very, very small eggs... called fart eggs.

Of course, being new to raisimg chickens, we thought that there was something seriously wrong with them.  But after a little research...(ok,  A LOT of research), we discovered that a fart egg had been laid.  Apparently, it occurs when reproductive tissue breaks away.  The chicken's body treats the tissue as a yolk and forms the rest of the egg around it.  However, the fart egg is completely yolk-free.  Who knew?