Common Seal vs Red-knotgrass

Phoca vitulina compared with Polygonum patulum

Key Differences

• Common Seal is Near Threatened while Red-knotgrass is Not Evaluated.

Taxonomic Classification

Rank	Common Seal	Red-knotgrass
Kingdom	Animalia (Animals)	Plantae (Plants)
Phylum	Chordata (Chordates)	Magnoliophyta (Flowering Plants)
Class	Mammalia (Mammals)	Magnoliopsida (Dicots)
Order	Pinnipedia (Seals & Sea Lions)	Caryophyllales (Caryophyllales)
Family	Phocidae (True Seals)	Polygonaceae
Genus	Phoca (Harbor Seals)	Polygonum
Species	Phoca vitulina	Polygonum patulum

Conservation Status

Common Seal

NT — Near Threatened

Population: ~500.0K

Trend: Stable →

Red-knotgrass

NE — Not Evaluated

Physical Characteristics

Attribute	Common Seal	Red-knotgrass
Diet	Carnivore	—
Average Lifespan	30 years	—
Average Length	1.7 m	—
Average Weight	80.0 kg	—

Habitat & Geographic Range

Common Seal

Habitat

Typically found in diverse ecosystems where prey species are available.

Range

Found across Europe (7 countries) and North America (United States). Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

Red-knotgrass

Habitat

Typically found in diverse terrestrial habitats from tropical forests to temperate regions.

Range

Widely distributed across Europe (16 countries), North America (Canada, United States), Oceania and the Pacific (Australia), and South America (Colombia).

Common Seal

The most widely distributed pinniped, harbor seals inhabit temperate and subarctic coastal waters of both the North Atlantic and North Pacific. Adults reach up to 130 kg and spend roughly equal time at sea hunting fish, squid, and crustaceans and hauling out on beaches or rocks to rest. Their large, expressive eyes are adapted for underwater vision in low light. Harbor seals are a critical food source for orcas, sharks, and polar bears.

Shared Countries

Both species can be found in 7 countries:

🇧🇪 Belgium 🇩🇰 Denmark 🇳🇴 Norway 🇵🇹 Portugal 🇷🇺 Russia 🇸🇪 Sweden 🇺🇸 United States