Basking shark vs Green Sea Turtle

Rhincodon typus compared with Chelonia mydas

Key Differences

• Basking shark is omnivore while Green Sea Turtle is herbivore.
• Basking shark is 100.0x heavier than Green Sea Turtle.
• Basking shark lives longer (100 years vs 80 years).

Taxonomic Classification

Rank	Basking shark	Green Sea Turtle
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Chondrichthyes (Cartilaginous Fish)	Reptilia (Reptiles)
Order	Lamniformes (Mackerel Sharks)	Testudines (Turtles & Tortoises)
Family	Rhincodontidae (Whale Sharks)	Cheloniidae (Sea Turtles)
Genus	Rhincodon (Whale Sharks)	Chelonia (Green Sea Turtles)
Species	Rhincodon typus	Chelonia mydas

Evolutionary Relationship

Basking shark and Green Sea Turtle share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Basking shark

EN — Endangered

Trend: Decreasing ↓

Green Sea Turtle

EN — Endangered

Population: ~85.0K

Trend: Decreasing ↓

Physical Characteristics

Attribute	Basking shark	Green Sea Turtle
Diet	Omnivore	Herbivore
Average Lifespan	100 years	80 years
Average Length	12.0 m	1.2 m
Average Weight	20.0 t	200.0 kg

Habitat & Geographic Range

Basking shark

Habitat

Found across multiple habitat types including temperate broadleaf and mixed forests, temperate grasslands and steppes, and montane grasslands and shrublands, among 5 distinct biome types within the Neotropic biogeographic realm.

Range

Distributed across Chile, Portugal, Taiwan, and Venezuela. Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

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.

Basking shark

The world's largest fish, whale sharks can exceed 12 meters and 20 tonnes, inhabiting tropical and warm temperate oceans worldwide. Despite their massive size, they are harmless filter feeders, consuming plankton, fish eggs, and small fish by swimming open-mouthed through prey-dense water. They undertake vast seasonal migrations following plankton blooms. Endangered due to fishing, boat strikes, and the live fin trade, with population declining by approximately 50% over the past 75 years.

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.