I hate to see any wildlife dead but that had to be one stoooopid owl - I thought they had expert vision to see the tiniest things - how did he miss seeing something that BIG! LOL
Also if you've been reading this thread we want to know why you're using flimsy poultry wire against predators that probably lurk in that wooded area in the photo. Raccoons, weasels, coyotes, foxes, dogs, bobcats, etc can easily push on poultry wire which is not interlinked and easily comes apart from itself when pushed on. Also you'll need to bury 1/2 inch hardwire into the ground and around the pen to deter digging night critters if you want to protect your babies from wildlife you never knew you had until you got poultry.
Smiles - we just want to help. BTW nice coop framework.