Here's why:
* Diet: Harbor seals are opportunistic feeders and their diet consists primarily of fish, but they also eat a variety of invertebrates, including shellfish.
* Feeding method: Harbor seals have a unique way of feeding on shellfish. They use their strong teeth to pry open the shells and then strain out the meat with their tongue.
While other seal species might occasionally eat shellfish, the harbor seal is particularly known for its shellfish-eating habits.