Head to head
Gray Seal vs Harbor Seal
The gray seal and harbor seal frequently haul out on the same North Atlantic beaches and rocks, close enough in general appearance that snout shape and size become the clearest ways to tell them apart.
| Gray Seal | Harbor Seal | |
|---|---|---|
| Scientific name | Halichoerus grypus | Phoca vitulina |
| Relative size | Larger | Smaller |
| Snout shape | Long, straight, horse-like | Shorter, more rounded |
| Global distribution | North Atlantic only | Northern Hemisphere, Atlantic and Pacific |
| Notable ecological link | Growing population linked to more white sharks | No comparable documented link |
| Conservation status | Least Concern | Least Concern |
| Population trend | Increasing | Stable |
| Diet | Carnivore | Carnivore |
Gray Seal vs Harbor Seal: common questions
How can you tell a gray seal from a harbor seal?
Snout shape and size are the clearest clues, since the gray seal has a distinctively long, straight, horse-like snout and a larger overall body, while the harbor seal has a shorter, more rounded face and a smaller, more compact build.
Which of these two seals has the wider range?
The harbor seal has the much wider range, present across coastal waters of both the Atlantic and Pacific throughout the Northern Hemisphere, making it one of the most widely distributed seal species in the world, while the gray seal is largely confined to the North Atlantic.
Why has the gray seal been linked to more white sharks near shore?
The recovering gray seal population off the northeastern United States has drawn increased white shark activity closer to shore because gray seals serve as a significant prey species for large sharks, an ecological link that has not been documented to the same degree with the smaller, less favoured harbor seal.