Common Seal vs Slippery Jack

Phoca vitulina compared with Suillus luteus

Key Differences

Common Seal is Near Threatened while Slippery Jack is Least Concern.

Taxonomic Classification

Rank	Common Seal	Slippery Jack
Kingdom	Animalia (Animals)	Fungi (Fungi)
Phylum	Chordata (Chordates)	Basidiomycota (Club Fungi)
Class	Mammalia (Mammals)	Agaricomycetes (Mushrooms)
Order	Pinnipedia (Seals & Sea Lions)	Boletales (Boletales)
Family	Phocidae (True Seals)	Suillaceae
Genus	Phoca (Harbor Seals)	Suillus
Species	Phoca vitulina	Suillus luteus

Conservation Status

Common Seal

NT — Near Threatened

Population: ~500.0K

Trend: Stable →

Slippery Jack

LC — Least Concern

Physical Characteristics

Attribute	Common Seal	Slippery Jack
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.

Slippery Jack

Habitat

Typically found in forest floors, decomposing wood, and soil ecosystems.

Range

Widely distributed across Europe (4 countries), North America (United States), and South America (Brazil, Chile).

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.