* Larger Sharks: Some larger sharks, like great white sharks, tiger sharks, and bull sharks, will sometimes prey on smaller sharks.
* Orcas (Killer Whales): Orcas are known to hunt and kill even large sharks like great white sharks.
* Other Large Marine Animals: Some other large marine animals, such as large fish (like groupers), crocodiles, and even some large squid, can pose a threat to smaller sharks.
It's important to remember that most of the time, sharks are at the top of the food chain and are not preyed upon often. The instances where they are preyed upon usually involve larger animals or larger sharks.