Common Seal vs Leatherback Sea Turtle

Phoca vitulina compared with Dermochelys coriacea

Key Differences

• Common Seal is Near Threatened while Leatherback Sea Turtle is Vulnerable.
• Leatherback Sea Turtle is 6.2x heavier than Common Seal.
• Leatherback Sea Turtle lives longer (50 years vs 30 years).

Taxonomic Classification

Rank	Common Seal	Leatherback Sea Turtle
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (cordados)	Chordata (cordados)
Class	Mammalia (mamíferos)	Reptilia (réptil)
Order	Pinnipedia (Seals & Sea Lions)	Testudines (Tartaruga)
Family	Phocidae (True Seals)	Cheloniidae (Sea Turtles)
Genus	Phoca (Harbor Seals)	Chelonia (Green Sea Turtles)
Species	Phoca vitulina	Dermochelys coriacea

Evolutionary Relationship

Common Seal and Leatherback Sea Turtle share a common ancestor at the Phylum level: Chordata. (cordados)

Conservation Status

Common Seal

NT — Near Threatened

Population: ~500.0K

Trend: Stable →

Leatherback Sea Turtle

VU — Vulnerable

Population: ~35.0K

Trend: Decreasing ↓

Physical Characteristics

Attribute	Common Seal	Leatherback Sea Turtle
Diet	Carnivore	Carnivore
Average Lifespan	30 years	50 years
Average Length	1.7 m	2.0 m
Average Weight	80.0 kg	500.0 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.

Leatherback Sea Turtle

Habitat

Found across multiple habitat types including tropical and subtropical moist broadleaf forests, tropical and subtropical dry broadleaf forests, and tropical and subtropical grasslands and savannas, among 5 distinct biome types spanning the Australasia and Indomalayan and Neotropic realms. Populations are also found in montane and highland environments at higher elevations.

Range

Distributed across Costa Rica, Indonesia, Malaysia, and Trinidad and Tobago. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Common Seal

O pinípede de distribuição mais ampla, a foca-comum (Phoca vitulina) habita as costas temperadas e subárticas do Atlântico Norte e do Pacífico Norte. Os adultos atingem até 130 kg e passam tempo aproximadamente igual no mar caçando peixes, lulas e crustáceos e descansando em praias ou rochas. Seus grandes e expressivos olhos são adaptados para a visão subaquática em pouca luz. A foca-comum é uma fonte de alimento fundamental para orcas, tubarões e ursos-polares.

Leatherback Sea Turtle

A tartaruga-de-couro é a maior tartaruga viva e o quarto réptil mais pesado. Ao contrário das demais tartarugas, possui uma carapaça mole e coriácea.