Flies swarm around cattle. (NDSU photo) https://www.ag.ndsu.edu/news/newsreleases/2018/june-4-2018/cattle-pest-control-vital/flies-swarm-around-cattle.ndsu-photo/view https://www.ag.ndsu.edu/news/logo.png Flies swarm around cattle. (NDSU photo) 2018-06-08.0210346009 — 1.4 MB