1. Sperm Whales: Sperm whales are the largest toothed whales and are known for their massive size and aggressive nature. They possess powerful jaws and a unique organ called the spermaceti organ, which is believed to be used in producing loud sounds and stunning prey. Sperm whales are known to defend themselves and their young vigorously against killer whales, and there have been instances where sperm whales have successfully counter-attacked and injured or killed killer whales during encounters.
2. Orcas: Killer whales themselves belong to the dolphin family, and there are instances where different orca pods have been known to engage in conflicts and even kill members of other pods. Orcas are highly social animals, and they may compete for territory or prey, leading to aggressive interactions and potential fatalities.
3. Great White Sharks: While killer whales are not the primary prey of great white sharks, there have been documented cases of these sharks attacking and killing orcas. Great white sharks are powerful predators known for their strong jaws and teeth, making them capable of inflicting severe injuries or even killing killer whales in encounters.
4. Walruses: Walruses are large marine mammals known for their tusks and aggressive nature, especially during breeding and calving seasons. While not as common as encounters with sperm whales or sharks, there have been instances where walruses have successfully defended themselves against killer whales, using their tusks to cause serious injury or death to the attacking orcas.
It's important to note that these interactions and confrontations are relatively rare occurrences within the complex and diverse marine ecosystem, where different species coexist and interact with varying degrees of competition, predation, and defense.