- America Zoo: Gray Seal - Halichoerus grypus
- Examines classification, source of name, location, habitat, physical characteristics, social behavior, and reproduction.
- Animal Diversity: Gray Seal (Halichoerus grypus)
- Provides pictures, classification, geographic range, habitat, physical description, reproduction, longevity, behavior, food habits, and status.
- BBC Nature: Grey Seal (Halichoerus grypus)
- Features overview, statistics, description, distribution, habitat, diet, behavior, reproduction, and conservation status.
- Grey seal (eastern Atlantic population) (Halichoerus grypus)
- ARKive.org details facts and status, description, range and habitat, biology, threats and conservation, and related species.
- Grey Seal (Halichoerus grypus (Fabricius, 1791))
- Offers appearance, distribution, feeding, population dynamics, interactions, population size, exploitation, and threats.
- Grey Seal (Halichoerus grypus)
- Information reviews range, population, status, lifestyle, and statistics from the Seal Conservation Society.
- Grey Seal, Halichoerus grypus
- University of Guelph details description, distribution, reproduction, ecology, and behavior.
- The Mammal Society: The Grey Seal (Halichoerus grypus)
- UK facts include appearance, range and habitat, diet, reproduction, status, and FAQ.
- MarineBio.org: Gray Seal (Halichoerus grypus)
- Examines description and behavior, world range and habitat, feeding behavior, life history, threats, and statistics.
- National Zoo: Gray Seal
- Information includes appearance, size, locations, at risk populations, habitat, natural and zoo diets, breeding and development, lifespan, behavior, neighbors, and fun facts.
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