That looks like one HAPPY cow! I always felt sorry for the cows out in the part of west Texas where I lived for a while...out there in all that cactus and rocks! My husband used to tell me that the ranchers would sometimes take cutting torches when it stayed dry for too long and burn the needles off the cactus so the cows could eat them. The cows would get a taste for cactus and every now and then he would see a cow that had eaten undoctored cactus walkng around with lips bristling with cactus needles! OUCH! Hurts to think about it!