I have noticed less mice trying to come inside this year. Maybe the fox got better at hunting than last year when my 8 year old chicken outran it, TWICE!
Malbri, More than likly its because you have a thriving population of owls, sharp shin hawks, Or a good number of snakes..Black snakes do a very good job of cleaning out mice and any rats, chipmonks anybody has. i like to see lots of blacksnakes around..