- Alaska Fish and Game: Harbor Seal
- Details include migration, behavior, physical characteristics, birth, development, lifespan, diet, population and trends, and fishery conflicts.
- Animal Bytes: Harbor Seal
- Gives scientific details, appearance, range, preferred habitat, diet, status, fun facts, and impact on their ecosystem. From SeaWorld.org.
- Animal Diversity: Harbor Seal (Phoca vitulina)
- Provides pictures, classification, geographic range, habitat, physical description, reproduction, longevity, behavior, food habits, and status.
- The Common Seal (Phoca vitulina)
- The Mammal Society reports physical appearance, UK range and habitat, social structure and breeding, longevity, conservation, and FAQ.
- Common Seal, Harbour Seal (Phoca vitulina)
- BBC Nature fact file covers lifespan by gender, appearance, locations, diet and feeding habits, social behavior, courtship and mating, and interaction with humans.
- Enchanted Learning: Harbor Seal
- Presents labeled coloring printout, behavior, relatives, locations, lifespan, appearance, diet, predators, and classification.
- Harbor Seal - Phoca vitulina
- America Zoo information explores classification, name, habitat, description, behavior, and reproduction.
- Harbor Seals
- ThinkQuest project looks at basic information, babies, facts, problems, mistakes, and solution.
- Harbour Seal, Phoca vitulina
- University of Guelph details description, distribution, reproduction, ecology, and behavior.
- Marine Mammal Center: Harbor Seal
- Presents description, range and habitat, mating and breeding, behavior, and status.
- Palomar.edu: Harbor Seal Fact Sheet
- Contains classification, habitat and distribution, general characteristics, communication, movement, diet and feeding habits, and reproduction.
- Seal Conservation Society: Harbour Seal (Phoca vitulina)
- Article offers range and habitat, populations, status, subspecies, migration, and mating.
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