Mantis egg case

Mantis religiosa?

These start out really frothy and then harden as they dry. When the eggs have hatched, it will look like a zipper down the center (with emergence holes and egg material poking out).

Thank you! I had no idea what it was!

I brought one of these indoors last fall & last week had about 100 tiny mantids emerge from it!
Please can you move this to the arthropods category. Thanks!