How do you get a Praying Mantis egg sac off of glass?

That depends if you are trying to save the life of the contents of the egg sak or not, if you are you don't touch it because it will damage them all and if one gets hurt it affects them all and if you don't care about the little guys then use windex just a suggestion if you maybe put something over the sak like a cup with holes in it and maybe a leaf or two and glue it to the window or put a peice of cardboard on the other side of the glass to block direct sunlight so they don't fry.

AnswerSlip a razor blade or an exacto knife between the glass and the bottom of the egg sac VERY carefully. A kitchen knife will probably be too thick. You're lucky to have breeding mantises, they're wonderful.