What are the animals that will kill just for the sake of killing?

Question

I've heard that aside from humans, there are only about five other animals that will kill just for the sake of killing (as opposed to killing for food or self-defense). Minks are supposed to be one of them. Do you know the others?

Answer 1

man and ants are the only two species on earth that make war on thier own species, is this what you meant? because i think the answer to what you asked is human, we are the only species on this planet that kills just to kill.

Answer 2

Weasels other than minks will kill more than they need for food. There are more than five species of them.

Answer 3

I think crocodiles and / or alligators are like this too.

They are programmed to kill for food, but don't have the intelligence to override the command even if they're not hungry.

Answer 4

I have heard sometimes rats kill just for the h**l of it.