Common Seal vs Marsh Cress

Phoca vitulina compared with Rorippa islandica

Key Differences

Common Seal is Near Threatened while Marsh Cress is Endangered.

Taxonomic Classification

Rank	Common Seal	Marsh Cress
Kingdom	Animalia (Animals)	Plantae (Plants)
Phylum	Chordata (Chordates)	Magnoliophyta (Flowering Plants)
Class	Mammalia (Mammals)	Magnoliopsida (Dicots)
Order	Pinnipedia (Seals & Sea Lions)	Brassicales (Brassicales)
Family	Phocidae (True Seals)	Brassicaceae
Genus	Phoca (Harbor Seals)	Rorippa
Species	Phoca vitulina	Rorippa islandica

Conservation Status

Common Seal

NT — Near Threatened

Population: ~500.0K

Trend: Stable →

Marsh Cress

EN — Endangered

Physical Characteristics

Attribute	Common Seal	Marsh Cress
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.

Marsh Cress

Habitat

Found across multiple habitat types including boreal forests and taiga, flooded grasslands and savannas, and Mediterranean forests and woodlands, among 4 distinct biome types within the Palearctic biogeographic realm. Populations are also found in montane and highland environments at higher elevations.

Range

Widely distributed across Africa (Libya), Asia (India), Europe (Iceland, Norway, Sweden), and North America (Canada, Mexico, United States). Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

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.