Four your viewing pleasure...
I suppose when the snow flew and all the bugs went away, the chickens were pissed. It appears they have upped the ante on the size of their game since. I noticed this hanging out of a chickens mouth from the house after lunch. I also suppose when the killing went down that is when the rooster set off the alarm we heard. He sounds the alarm at the wind moving a tall piece of grass so it wasn't really noticed at the time.
When we first got chickens several years ago, one of our hens ate a whole snake. The next day she laid her first egg. And her second. They can take down some pretty large stuff, and they will enjoy it!
I've seen my hens capture mice and eat them. And several times I've witnessed a group of hens grab a dove, mob it, kill it, then eat it. Incredible mini dinosaurs. I don't think I'd be interested in seeing anyone breed giant 30-40 pound chickens. Far too dangerous at that size.
It's never too late to start! I retired to homestead on the slopes of Mauna Loa, an active volcano. I relate snippets of my endeavor on my blog : www.kaufarmer.blogspot.com