* Orcas (Killer Whales): Orcas are the most common predator of whales, particularly calves. They are highly intelligent and coordinated, and their hunting strategies can be quite effective.
* Sharks: Large sharks, like Great Whites and Tiger Sharks, can prey on smaller whales and whale calves. However, these attacks are less common compared to orcas.
* Polar Bears: In the Arctic, polar bears can hunt and kill young bowhead whales that are stranded on ice.
* Humans: Human activities such as hunting, fishing, and pollution pose significant threats to whales.
It's important to remember that most whales are very large and strong, making them difficult targets for predators. They also have various defense mechanisms, such as size, speed, and vocalizations.