For about 8 months, we've been battling what we thought was a weasel. We found several of our younger chickens in the hen house dead with the back of their necks bitten and their entrails removed through a hole in their bottom, which from what I understand, is the MO of a weasel. We also would have eggs that had been cracked open and eaten. We recently started finding tunnels between our two chicken pens, one tunnel is very long, probably about 6 feet. This week, we set out some rat traps at night in the chicken pens using pieces of chicken as bait; and last night, we caught a big rat. So now, I'm wondering if this was the culprit that's been killing my chickens and eating eggs, or if there still might be a weasel lurking around. We're going to keep setting the traps, just in case. But can a rat kill almost grown chickens?