Our yard bordered a drainage ditch. One night our black cat left 8 or 9 rats' heads on the back steps, ordered from largest to smallest. She wasn't telling us we were bad hunters, she was bragging what a good hunter she was. Good cat. When she was old, Dad took her to a vet, beautiful & healthy except for her kidneys, who talked Dad into putting her down; i was royally pissed. And i've met vets since who obviously don't like animals.
This story called to mind the Canadian psycho that posted videos of him killing kittens. Then he murdered and ate parts of his roommate. They caught him in London, i think, in a cafe googling news stories about himself.