Basking shark vs European otter

Rhincodon typus compared with Lutra lutra

Key Differences

• Basking shark is Endangered while European otter is Vulnerable.
• Basking shark is omnivore while European otter is carnivore.
• Basking shark is 2000.0x heavier than European otter.
• Basking shark lives longer (100 years vs 10 years).

Taxonomic Classification

Rank	Basking shark	European otter
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Chondrichthyes (Cartilaginous Fish)	Mammalia (Mammals)
Order	Lamniformes (Mackerel Sharks)	Carnivora (Carnivorans)
Family	Rhincodontidae (Whale Sharks)	Mustelidae (Weasels & Otters)
Genus	Rhincodon (Whale Sharks)	Lutra (Otters)
Species	Rhincodon typus	Lutra lutra

Evolutionary Relationship

Basking shark and European otter share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Basking shark

EN — Endangered

Trend: Decreasing ↓

European otter

VU — Vulnerable

Trend: Stable →

Physical Characteristics

Attribute	Basking shark	European otter
Diet	Omnivore	Carnivore
Average Lifespan	100 years	10 years
Average Length	12.0 m	1.0 m
Average Weight	20.0 t	10.0 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.

European otter

Habitat

Typically found in diverse ecosystems where prey species are available.

Range

Found across Europe (6 countries). 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.

European otter

Sleek semi-aquatic mustelid found along clean rivers, streams, and coastlines across Europe and Asia. European otters can reach 1.3 meters in length and are highly skilled fish hunters, using sensitive whiskers to detect prey movements. Requiring unpolluted water with abundant fish, they are an indicator species for freshwater ecosystem health. Once nearly extinct in Western Europe from hunting and pollution, populations have recovered significantly following water quality improvements.