Basking shark vs Leatherback Sea Turtle

Rhincodon typus compared with Dermochelys coriacea

Key Differences

• Basking shark is Endangered while Leatherback Sea Turtle is Vulnerable.
• Basking shark is omnivore while Leatherback Sea Turtle is carnivore.
• Basking shark is 40.0x heavier than Leatherback Sea Turtle.
• Basking shark lives longer (100 years vs 50 years).

Taxonomic Classification

Rank	Basking shark	Leatherback 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	Dermochelys coriacea

Evolutionary Relationship

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

Conservation Status

Basking shark

EN — Endangered

Trend: Decreasing ↓

Leatherback Sea Turtle

VU — Vulnerable

Population: ~35.0K

Trend: Decreasing ↓

Physical Characteristics

Attribute	Basking shark	Leatherback Sea Turtle
Diet	Omnivore	Carnivore
Average Lifespan	100 years	50 years
Average Length	12.0 m	2.0 m
Average Weight	20.0 t	500.0 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.

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.

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.

Leatherback Sea Turtle

The leatherback is the largest living turtle and the fourth-heaviest reptile. Unlike other turtles, it has a soft, leathery shell.