Please remember that you should be able to provide reputable sources for your comments, and they should not contain personal anecdotes about your pets, or other animal behaviors you may have personally observed.
Radiolab had a podcast episode about this (“zoos”). Big cat predators in zoos are well fed, but they are bored and show low brain activity while in captivity.
A squirrel got into a cage and a panther spent hours chasing it and hunting it - like housecats, their brains are set up to be stimulated by hunting and chasing, even if full.
In some zoos in China, they have experimented with giving lions live calves to chase and eat. And it’s popular to have tourists buy a live chicken in the zoo to send down a tube chute so the big cats can chase and eat it.
House Cats. Seriously. The common, everyday, run-of-the-mill House Cat. They don't kill things because they're hungry, they do it because it's fun. They're more vicious than any Big Cat on Earth. The *only* reason they're not considered as *dangerous*, is because they're so small.
["*The estimated kill rates are two to four times higher than mortality figures previously bandied about, and position the domestic cat as one of the single greatest human-linked threats to wildlife in the nation. More birds and mammals die at the mouths of cats, the report said, than from automobile strikes, pesticides and poisons, collisions with skyscrapers and windmills and other so-called anthropogenic causes.*"](https://mobile.nytimes.com/2013/01/30/science/that-cuddly-kitty-of-yours-is-a-killer.html?referer=https://www.google.com/)
There are documented cases of mountain lions, wolves, and tigers killing and not eating what they’ve killed. Whether for sport or because their kill drive “stayed on” in relatively close proximity to prey animals after the first kill is unknown.
Foxes will go on killing sprees in chicken coops but only take one or two. Leopards will apparently do the same in ostrich farms. Not sure if it counts as sport hunting since there's no evidence it's premeditated rather than just a blood frenzy
I know that you asked specifically about animals hunting for sport, but I thought you might be interested in another non-food hunting behavior.
Lions prey on elephant calves, and elephants understand that. Therefore, [elephants will carry out unprovoked (and provoked) attacks on lion cubs](https://books.google.com/books?id=7ann2dYn9iYC&pg=PA189&lpg=PA189&dq=elephants+kill+lion+cubs&source=bl&ots=l08LB05frh&sig=StRmIAaXVT7FUnXG6pda6ejz2n0&hl=en&sa=X&ved=2ahUKEwi27b-LloDYAhUOON8KHcndDGI4ChDoATAGegQIARAB#v=onepage&q=elephants%20kill%20lion%20cubs&f=false). Presumably they understand that killing the cubs reduces future adults which will prey on their own young.
Snakehead! Species of fish indigenous to Asia and parts of Africa. Known to be one of the most aggressive fish species alive today due to it attacking and killing anything that comes close to it, for literally no reason. There is a national conversation going on about these fish because they've been introduced into freshwater in the extreme eastern United States, and are taking over since there's no predatory fish that match them, and they can lay well over 20000 eggs in one year. They've been spotted in Florida, Georgia, Maryland, North Carolina, and in parts of some major rivers.
EDIT: forgot to mention they CAN BREATHE AIR and live out off water for days at a time. There's a great documentary from nat Geo about them.
If you define hunt as to pursue and not to kill. I believe orcas would be the best definition of hunting for sport. They try techniques to learn how to utilize new tactics. They play with prey and learn from the actions. This hunting for sport or to gain. I'm on mobile so I can only copy one link at a time.
there is a famous story of a tiger that tracked down a human hunter that had taken one of his kills and murdered the guy in his cabin. Lay in wait and murdered him.
Elephants too have displayed vicious behavior with immature males forming packs and terrorizing small animals in nature perserves. eventually large adult males were brought in and the behavior stopped
Chimpanzees are thought to hunt for sport. Some groups of chimps hunt red colobus monkeys and it was once thought that they hunted when their usual sources of food were sparse, but they actually hunted more when they had a steady supply of food (because going on a hunt is a labor intensive activity, so they need plenty of food and time before they can even think about going hunting). One study concluded that chimpanzees share meat after hunting to form strong alliances with other chimps.
The study I got this info from is titled "Why do chimpanzees hunt and share meat?" by John Mitani and David Watts.