I caught one of my cats rolling around like a psycho outside so I went to see what she was doing. She was rolling in ants so I pulled her out and ran inside to get a rag to scrub the ants off with. She went back to the same spot to roll in the ants. I had to spray her and the spot of ants to get her to stop.
Long story short if anyone wants a cat I have 4 I need to rehome.
I frequently have to spray areas in the back yard for this same reason. I read cats do it bc they are lacking in vitamins and they get them when they clean themselves after rolling in dirt. The ant thing...no idea lol