They can't and don't, they have no chance of defending themselves. Instead they are harpooned and killed with out a chance to even know what's happening. If an orca met a human one on one it would just ignore the human.
dolphins defend themselve by using their mouths againts predators like sharks and orcas
no but they do attack humans
Orcas are harmless to humans unless they are provoked. They typically do not want to attack humans because they are not desirable prey.
yes
Dolphins, Porpoises and humans
Yes they could, especially if humans were a food source for orcas, however wild orcas are not considered a threat to humans.
Narwhales primarily defend themselves by using their agility and speed in the water to evade predators, such as orcas. Their long, spiral tusks, which are actually elongated teeth, can also be used in defense during encounters with threats, though they are more commonly associated with mating displays and social interactions. Additionally, narwhales often travel in groups, providing safety in numbers against potential attackers.
Narwhals can grow to be large in order to help them survive in their Arctic environment, where they need a large body size to maintain heat in the cold water. Additionally, their size may also help them to defend themselves against predators, such as polar bears and orcas.
They have no predators they are apex predators.
Orcas, humans, and walruses can.
Orcas (Very unlikely)or Humans :(
Orcas and humans