Even plants have life, though they don't walk, run or fly as does animals & birds. If one does not eat that which is killed, they will in a very short time be simply be dead of starvation.
I grew up on home killed chicken, pork, beef & goat meat, along with some game & fish. I still wish that I was able to survive primarily on that which I had killed myself, rather than slaughter house killed from the store.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra