 Vicious little guys. They hurt. Yes, they do. They bite hard, and it's not pleasant. And cattle out on pasture are going to be affected by that. You can put some insecticides on them or an insecticide-coated ear tag to try to keep them away. And when you're looking around on pasture, check to make sure that there are no injuries. Nobody's limping because that also leads to poor conditions for the animal, whether it's their body conditions and otherwise.