Can you I'd this egg sac I found on patio attached to a piece of wood

Post's pictures

image.jpg, 827.65 kb, 2327 x 2173

sorry but no-one seems to know the answer to your queston. I expect by now or very soon you will know what animal has emerged!

It looks to be an ootheca (eggcase) of a praying mantis. Without your location it's impossible to tie down any further. But, as a point of note, if those are indeed holes i'm seeing along the midline, it already hatched, maybe some time ago. The eggs are laid along the midline. The cases are tough and can survive quite a long time (several years even) if kept died.