Emperor Penguin vs Green Sea Turtle

Aptenodytes forsteri compared with Chelonia mydas

Key Differences

• Emperor Penguin is Near Threatened while Green Sea Turtle is Endangered.
• Emperor Penguin is carnivore while Green Sea Turtle is herbivore.
• Green Sea Turtle is 5.0x heavier than Emperor Penguin.
• Green Sea Turtle lives longer (80 years vs 20 years).

Taxonomic Classification

Rank	Emperor Penguin	Green Sea Turtle
Kingdom same	Animalia (สัตว์)	Animalia (สัตว์)
Phylum same	Chordata (สัตว์มีแกนสันหลัง)	Chordata (สัตว์มีแกนสันหลัง)
Class	Aves (นก)	Reptilia (สัตว์เลื้อยคลาน)
Order	Sphenisciformes (Penguins)	Testudines (เต่า)
Family	Spheniscidae (Penguins)	Cheloniidae (Sea Turtles)
Genus	Aptenodytes (Great Penguins)	Chelonia (Green Sea Turtles)
Species	Aptenodytes forsteri	Chelonia mydas

Evolutionary Relationship

Emperor Penguin and Green Sea Turtle share a common ancestor at the Phylum level: Chordata. (สัตว์มีแกนสันหลัง)

Conservation Status

Emperor Penguin

NT — Near Threatened

Population: ~595.0K

Trend: Stable →

Green Sea Turtle

EN — Endangered

Population: ~85.0K

Trend: Decreasing ↓

Physical Characteristics

Attribute	Emperor Penguin	Green Sea Turtle
Diet	Carnivore	Herbivore
Average Lifespan	20 years	80 years
Average Length	1.1 m	1.2 m
Average Weight	40.0 kg	200.0 kg

Habitat & Geographic Range

Emperor Penguin

Habitat

Found across multiple habitat types including temperate broadleaf and mixed forests, temperate coniferous forests, and boreal forests and taiga, among 4 distinct biome types within the Palearctic biogeographic realm. Populations are also found in montane and highland environments at higher elevations.

Range

Found in Norway. 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.

Emperor Penguin

The world's largest penguin, emperor penguins stand up to 1.2 meters and weigh 45 kg, inhabiting the Antarctic continent in some of the most extreme conditions on Earth. They breed in midwinter darkness at temperatures below -60°C, with males incubating single eggs on their feet under a brood pouch for 65 days while females are at sea. Their huddling behavior — cycling individuals through the warm center of thousands-strong groups — is a masterclass in cooperative survival.

Green Sea Turtle

The green sea turtle is one of the largest sea turtles. They are named for the green color of their cartilage and fat, not their shells.