Here's why:
* Tiger sharks are predators: They are apex predators that primarily feed on fish, sea turtles, seabirds, and even other sharks. Crabs are a part of their diet.
* Crabs are prey: While some crabs might be large and strong, they are still vulnerable to tiger sharks.
While some animals have complex relationships with their predators, like cleaner fish and sharks, tiger sharks and crabs do not have a beneficial relationship. This is a classic example of a predator-prey relationship.