Nature can be a mysterious, wonderful, and fascinating thing to explore.  However, on the flip side of that, it can also be a truly gruesome and almost cruel spectacle to see. Animals in the wild are in a truel battle for survival and aren't beholden to the niceties and social norms we humans are and they often don't hold back when it comes to protecting their food and/or territory.

In this wild video, the world's largest shark swims helpless as a killer whale sucks the liver right out of it and then sinks into the depths.