Does anyone else's chicken's sometimes lay a Teeny Tiny Egg. I have gotten 2 this week. They are smaller in diameter then a quarter even. We cracked one open for giggles and there was a little speck of a yolk. The kids thought it was cute. Me...I am concered as they have never done this before. they Free range most of the day and there is feed/oyster shell ALWAYS available and fresh/changed every other day or so water/more so when its hot out to keep it cooler. When the eggs are normal(which has been always except for 2 times) they eggs are big, brown, and hard shelled. Any ideas?