Quite reasonable and direct as a survival mechanism. If seen from a human's perspective it just might seem to be "cruel", "barbaric" or just "ew gross".
However, if you think of it a little more - you'll find out that humans and other living beings do pretty much the same at varying levels of involvement or directness (which gets more and more abstract the more "advanced" [for animals] or "civilized" [for humans] they are).
Real cats do - yes. Fat, castrated, cute cuddly furballs that have been pampered by humans might get to it eventually. It's not done out of cruelty though, it's mostly play and practicing hunting techniques - and that's why younger cats do it, older cats just get to the point much faster unless they have young ones to train. Cats are perpetually amused animals and they do rule the world after all. Even leaves that fall off trees, fall because they want to get the attention of a passing cat.
They assert their domination in such a manner. If you pay attention to stray dog packs (if you have any in your area) you can see all about their hierarchy. Same goes with chickens (easier to find and observe). In fact, humans are more like chickens in their basic social behaviour.
There's no ethics in it and there are no points of satisfaction or grudges between animals - it's as is it, clean, to the point and for the moment. And usually (if not always) it's a direct matter of survival. There's no sense of justice or morals. Quite contrary to humans.