Common Seal vs Dusky Dolphin

Phoca vitulina compared with Lagenorhynchus obscurus

Key Differences

• Common Seal is Near Threatened while Dusky Dolphin is Least Concern.

Taxonomic Classification

Rank	Common Seal	Dusky Dolphin
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class same	Mammalia (Mammals)	Mammalia (Mammals)
Order	Pinnipedia (Seals & Sea Lions)	Cetacea (Whales & Dolphins)
Family	Phocidae (True Seals)	Delphinidae (Oceanic Dolphins)
Genus	Phoca (Harbor Seals)	Lagenorhynchus
Species	Phoca vitulina	Lagenorhynchus obscurus

Evolutionary Relationship

Common Seal and Dusky Dolphin share a common ancestor at the Class level: Mammalia. (Mammals)

Conservation Status

Common Seal

NT — Near Threatened

Population: ~500.0K

Trend: Stable →

Dusky Dolphin

LC — Least Concern

Physical Characteristics

Attribute	Common Seal	Dusky Dolphin
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.

Dusky Dolphin

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

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.