Seals protect themselves by using their sensitive ears to let them know when they should swim away from danger, and by using their sharp teeth and strong jaws to defend themselves if they need to fight. A seal's streamlined body allows them to swim away from predators at rapid speeds, which is typically how the seals stay away from predators.
Seals have very thick fur and an even thicker layer of blubber to keep them warm in their cold climate. Because of their thick skin, it is hard for most animals to attack seals simply because their predators must have large teeth. For this reason, the two main predators of all seal species are sharks and killer whales.
A seal's first line of defense from sharks and whales is their ability to detect and move away from danger. They have very sensitive ears and are able to swim very quickly with strong fins. Furthermore, they are semi-aquatic creatures, which means that they can climb onto land to avoid being attacked by predators in the water. If the animal simply cannot get away from predators in the water, they have strong jaws and large, sharp teeth that can be used to bite and wound any animals that may be attacking them.