Why is it difficult for predators to catch harbor seals?

Harbor seals are difficult for predators to catch due to their agile swimming abilities and streamlined bodies, which allow them to quickly navigate through water. They also have a keen sense of awareness and can detect predators from a distance, often escaping before they are threatened. Additionally, harbor seals frequently use underwater structures and rocky environments for cover, further complicating a predator's pursuit. Their ability to hold their breath for extended periods also gives them an advantage in evading attacks.