Harbor seals are medium-sized marine mammals, typically reaching 5 to 6 feet in length and weighing up to 300 pounds. Males are generally slightly larger than females.
Harbor Seal Size and Weight
These charismatic pinnipeds exhibit a moderate build, adapted for both aquatic and terrestrial environments. While they maintain a relatively consistent size range, individual dimensions can vary based on age, health, and geographic location.
Detailed Dimensions
The following table summarizes the average size characteristics of harbor seals:
| Characteristic | Measurement | Notes |
|---|---|---|
| Length | 5 to 6 feet (1.5 - 1.8 m) | Measured from nose to tail. |
| Weight | Up to 300 pounds (136 kg) | Can fluctuate with season and feeding. |
| Gender | Males slightly larger | A subtle difference, not always obvious. |
For more information on marine mammal sizes, you can explore resources from NOAA Fisheries or National Geographic.
Unique Physical Traits and Movement
Harbor seals are classified as "true seals," also known as "crawling seals." This classification is based on several distinct physical features that influence their movement and interaction with their environment.
- Ear Holes: Unlike "eared seals" (like sea lions), harbor seals possess small, barely visible ear holes rather than external ear flaps.
- Small Flippers: Their small front flippers and their inability to rotate their hind flippers forward make them less agile on land compared to sea lions.
- Terrestrial Movement: When on land, harbor seals move by flopping along on their bellies, a distinctive motion often referred to as "galumphing." This method allows them to navigate rocky shores and sandy beaches, although they are far more graceful in the water.
These adaptations enable them to haul out on diverse coastlines for resting, pupping, and molting, showcasing their unique blend of aquatic prowess and terrestrial perseverance.
