Even 'nocturnal' animals will strike during daylight sometimes. Netting is not very secure to keep any kind of predator except flying ones, out. Many of them will tear right through it, and many of them climb easily. Once they have success they will continue to come back. If you can set up a game camera, you will likely get a picture of whatever it is. I would work on securing your roof with something stronger than netting. 1/2 inch hardware cloth will keep most everything out if it's secured well.