Yes, that is what is so concerning about weasels. 1. they can come during the day and 2. that they can get into any hole larger than 1 inch.Yes, Hardware cloth everywhere. I have been building a addition to the coop for feed storage and a 1 bedroom apartment if needed for the Roo. My plan was to use fencing with 1x2 inch opening on the run for the addition which the chickens would get only a few hours a day in it to let them get some grass, but seeing these 2 weasels at 11 am made me see I need hardware cloth there also.