SCG What was your giant critter???
It is an opossum.
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SCG What was your giant critter???
I've decided to line the floor of the run with hardware cloth next spring, a few inches down. The coop is on cinder blocks and the space underneath is inaccessible for humans, but great for rodents. I can't monitor what is going on under there, or put traps or poison. Even if I was able to kill off this batch of rats, I think others will always move in to this large, dry, protected area under the coop.
Inside the run, where the rats keep tunneling up, I tried putting some scraps of hardware cloth with bricks on it, and it definitely deters them. They eventually make new tunnels, but if I could line the whole "floor", I think it would put an end to them coming in.
Meanwhile, I'm coming up with other silly schemes to entertain myself. I'd like to put a cage with poison in it directly over the large rat tunnel. When they come up their hole, they'll be in the dead-end cage and I can watch the poison to see if they take the bait. I've thrown poison down other holes, but it disappears out of sight and they don't appear to be eating it.