I agree with all of the above. Also there are fewer trappers here, which made for more mink. My favorite pond for rats, the mink beat me to it. I will be mink trapping next year for sure.
I also had one Very well known, old, trapping fart, give me a theory on canableism. When food is short, and habitat is being
reduced the parents will eat the young. He backs his theory up with the fact that few small rats come into his shop. Most all of the rats that are brought in are adult.
I don't know if I go along with this theory, but I thought
I'd throw it out to you.
Also remember rats are about as low as you can go on the food chain. Just about everything preys on them.
and last, 2 of the ponds I use to trap are now landscaped and mowed around to look nice. No more rats left in this twp.