Common Seal vs Green Sea Turtle

Phoca vitulina compared with Chelonia mydas

Key Differences

• Common Seal is Near Threatened while Green Sea Turtle is Endangered.
• Common Seal is carnivore while Green Sea Turtle is herbivore.
• Green Sea Turtle is 2.5x heavier than Common Seal.
• Green Sea Turtle lives longer (80 years vs 30 years).

Taxonomic Classification

Rank	Common Seal	Green Sea Turtle
Kingdom same	Animalia (动物界)	Animalia (动物界)
Phylum same	Chordata (脊索动物门)	Chordata (脊索动物门)
Class	Mammalia (哺乳動物)	Reptilia (爬行纲)
Order	Pinnipedia (Seals & Sea Lions)	Testudines (龟鳖目)
Family	Phocidae (True Seals)	Cheloniidae (Sea Turtles)
Genus	Phoca (Harbor Seals)	Chelonia (Green Sea Turtles)
Species	Phoca vitulina	Chelonia mydas

Evolutionary Relationship

Common Seal and Green Sea Turtle share a common ancestor at the Phylum level: Chordata. (脊索动物门)

Conservation Status

Common Seal

NT — Near Threatened

Population: ~500.0K

Trend: Stable →

Green Sea Turtle

EN — Endangered

Population: ~85.0K

Trend: Decreasing ↓

Physical Characteristics

Attribute	Common Seal	Green Sea Turtle
Diet	Carnivore	Herbivore
Average Lifespan	30 years	80 years
Average Length	1.7 m	1.2 m
Average Weight	80.0 kg	200.0 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.

Green 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 8 distinct biome types. Populations are also found in montane and highland environments at higher elevations.

Range

Distributed across Australia, Brazil, Costa Rica, Indonesia, and Mexico. Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Common Seal

分布最广的鳍足类动物港海豹（Phoca vitulina）栖居于北大西洋和北太平洋温带及亚北极沿海水域。成体体重可达130千克，在海中捕食鱼类、鱿鱼和甲壳动物，并在沙滩或礁岩上休息，两者时间大致相当。大而富有表情的眼睛适应于弱光下的水下视觉。港海豹是虎鲸、鲨鱼和北极熊的重要食物来源。

Green Sea Turtle

绿海龟是最大的海龟之一。其名称源于软骨和脂肪的绿色，而非龟壳的颜色。