Over a month's period we have lost as many as six glass eggs a week, sometimes four a day. We have never seen a snake. Nothing has climbed under the fence, no digging. The hens have never been harmed. Sometimes we lose a lot of eggs a day, sometimes not,. No skunk smell. Ground too hard or vegetation-covered for tracks. We have never found a dead snake filled with a glass egg(s). I've lived in the country a long time, and this a mystery to me! Any suggestions?