I have a pit bull/dalmatian mix (at least we think so) and she has "murder" as a significant part of her brain considering she's happily killed countless animals (and brought many through the dog door). She usually doesn't eat them, she just kills them and hangs on to them like a trophy until we can get them away from her, which is not easy.
Also, the best day of her life is when some stupid bunny decided to give birth to her babies in our back yard and she found them and ate all of them, slurping them up one by one like spaghetti as we watched in horror. It was the best day of her life.
Prey drive is no joke. My sister has a heeler/corgi mix, and taking her for a walk is an exercise in not dislocating your arm whenever she spots a small animal. She's adorabloodthirsty.
Oddly her other dog, a heeler/pit mix, is super chill with no apparent prey drive whatsoever. I'm pretty sure you could hold a baby bird in front of his face and he'd just sniff at it dumbly with his tail wagging.
I had a bordercollie that would eat feces. Also a lab cross who would chew carpet, fun times chasing him around trying to pull the dangling poop out of his but.