In the wild, life is so cheap and valueless that when we witness unspeakable acts of horrific wild violence, we have to condition it: wild is wild, nature is nature, human expectations and morality don't apply.
Fungi beat us in this respect. Most of them feed exclusively on dead matter.
All the herbivores in Animal Kingdom would disagree with that statement.
Here is a goat eating baby chickens...http://imgur.com/kHJhMjW
Think of a squirrel, perhaps, and how it feeds on plants.
(Still don't agree with the GP)
Which happens when they pass through the gut, essentially.