Killer whales have no natural enemies, and humans are not natural enemies of killer whales. Natural enemies are not the concept of ecology, but biological control. Therefore, the concept of natural enemies can only be found when targeting certain creatures. Killer whales are top predators, and there are no other animals in the environment that can eat them. Human beings will not specially hinder the activities of killer whales and limit their number, so killer whales have no natural enemies.

1. Body size advantage: The reason why killer whales have no natural enemies is because of their body size advantage. Simply put, those who are bigger than killer whales are not as aggressive as killer whales. Killer whales belong to toothed whales, and toothed whales larger than them also exist. For example, sperm whales are the largest toothed whales, but these toothed whales are basically specialized and can only eat cephalopods, which poses no threat to killer whales at all.

2. IQ advantage: killer whales have no natural enemies, mainly because of their superior IQ. It is not only the smartest animal in water. Looking at the whole nature, no animal except human beings dares to say that it is smarter than killer whales. This cleverness enables killer whales to establish a stable social system, so that killer whales can inherit it, thus reducing the learning cost of hunting.

3. Environmental advantages: killer whales live in the ocean, which is the main reason why they have no natural enemies. Although human beings also hunt whales, killer whales are widely distributed and like to move at a depth of 20-60 meters, so they are rarely hunted by human beings, which leads to their lack of natural enemies.