Sorry to hear about this latest attack. I think you have convinced me bamboo is not in my future.....and I thought crabgrass was bad.
My daughter informed me yesterday that after nearly a year with no issues, they had something dig under their hoop coop and got a single bird. Strange thing was it broke out from inside the coop vs. taking the bird back through the hole where it came in. Likely suspects were the fox that hangs out in their backyard or a coon. Latter being the mostly likely suspect due to breaking down the door from the inside......but only killed and took one bird instead of them all. Single bird could have been the fox, but the breakout part wasn't consistent with their normal patter.
I loaned them a spread of live traps and dog proof types and they had a BIG coon in the live trap this morning. That coon is now deceased and is on the menu for the local buzzards. Sometimes ya gotta snuff em to save the birds and this was one of those times. Traps still set to snag any more perps that might be lurking around.