Mice are swarming cattle and pigs in Australia, eating them alive. Gruesome to be sure:Ravenous Mice Eating Livestock in South Australia | Buzzesque
The article doesn't give much in the way of the theories as to why. Though one can infer that there are too many mice and not enough food for them to consume, therefore, they're seeking other food sources.
In the beginning of things men were animals and animals men. ~ Algonquin saying
"For instance, on the planet Earth, man had always assumed that he was more intelligent than dolphins because he had achieved so much — the wheel, New York, wars and so on — whilst all the dolphins had ever done was muck about in the water having a good time. But conversely, the dolphins had always believed that they were far more intelligent than man — for precisely the same reasons." ~ The Hitchiker's Guide to the Galaxy