This goes off on a tangent, but you comment about cows licking bones for calcium made me think of something I saw one time. Just looked it up. Sure enough:
Do Cows Eat Rabbits? The more rabbits they ate, the less phosphorous deficient they became thanks to the mineral content of the rabbits’ bones, leading scientists to discover that when necessary, even cows can become carnivores to solve their mineral deficiencies. Do cows ever eat meat...
corapark.com
now are you ever going to reasonably expect to see a cow eating a rabbit? My thought would be no, but I have seen this pictured before (yes, absurdly strange) and I've seen two separate articles indicating that it's caused by a phosphorus deficiency. I take this with a grain of salt but one of the articles (not the one above) appeared to have legitimate research tied to it. It wasn't social media either, but it was on the internet. I'm of the belief you can't believe everything you see on the internet. So do I believe it? (grain of salt) Do I think its totally preposterous? (please present me the facts and evidence supporting this claim that, on the surface, appears totally absurd)