Common Seal vs Opal chimaera

Phoca vitulina compared with Chimaera opalescens

Key Differences

• Common Seal is Near Threatened while Opal chimaera is Least Concern.

Taxonomic Classification

Rank	Common Seal	Opal chimaera
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Mammalia (Mammals)	Holocephali (Holocephali)
Order	Pinnipedia (Seals & Sea Lions)	Chimaeriformes (Chimaeriformes)
Family	Phocidae (True Seals)	Chimaeridae
Genus	Phoca (Harbor Seals)	Chimaera
Species	Phoca vitulina	Chimaera opalescens

Evolutionary Relationship

Common Seal and Opal chimaera share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Common Seal

NT — Near Threatened

Population: ~500.0K

Trend: Stable →

Opal chimaera

LC — Least Concern

Physical Characteristics

Attribute	Common Seal	Opal chimaera
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.

Opal chimaera

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.