It's often said that man is the only animal that kills for fun, but that's not true. Animals that thrill kill are fairly common, and scientists call the behavior "surplus killing." Animals that kill for no reason are usually mammals, but include a wide range of sizes, from tiny stoats to towering elephants. So, which animals kill for sport, and how do they do it? The subject is just as fascinating as it is horrifying.
Over centuries of study, scientists have seen animals use tools like humans and animals use disguises like humans, and now we know that they sometimes kill for fun like humans, too. By fun, we mean they don't do it over territorial disputes, in self-defense, to get food, or to move up in the pack hierarchy. Instead, these animals kill for seemingly no reason at all other than enjoyment.
Leopards Regularly Kill For Fun, Sometimes With Hundreds Of Victims