The stray barn cat back blip

We have a few wild barn cats that come to visit from time to time. The lady who owned our house many years ago had over 100 cats and was called the crazy cat lady. I guess they took to the woods when she passed away. I've been told they were all wild and lived in the barn. We have only seen 3 different ones since we have been on the farm. There are cat openings all around the barn so they can come and go. I have to admit if I go in and one is in there it startles me but other than that I appreciate the job they do keeping the mice away.