Predators of humpback whales include orcas (killer whales) and humans. Killer whales are not always successful in their attacks, which is why many humpback whales bear scars from orcas' teeth.
The population of humpback whales was impacted greatly by commercial whaling, but subsequent laws meant to reduce human predation has allowed the population to rebound. However, they still sometimes get caught in fishing nets, which continues to threaten their numbers.
Among marine animals, the orca presents the greatest danger to the humpback whale. Experts believe that humpbacks have migrated to tropical areas like Hawaii to avoid killer whale attacks because orcas avoid those waters.