Killer whales, sharks and false killer whales eat whales. False killer whales and killer whales may hunt whales in packs. Humans are largely considered to be the primary predator of whales.
Because of the large size and thick skin of many species of whales, it makes it difficult for natural predators, such as killer whales and sharks, to kill and eat full-grown whales. The few natural predators of the whale often choose to hunt baby whales or smaller species of whales, because they are easier to kill.
Even though whale hunting is no longer practiced in many countries due to laws protecting the animals, over-fishing, use of sonar devices, global warming and environmental pollution caused by humans all continue to kill whales.