Basking shark vs blue whale

Rhincodon typus compared with Balaenoptera musculus

Key Differences

• Basking shark is Endangered while blue whale is Vulnerable.
• Basking shark is omnivore while blue whale is carnivore.
• blue whale is 7.5x heavier than Basking shark.
• Basking shark lives longer (100 years vs 90 years).

Taxonomic Classification

Rank	Basking shark	blue whale
Kingdom same	Animalia (สัตว์)	Animalia (สัตว์)
Phylum same	Chordata (สัตว์มีแกนสันหลัง)	Chordata (สัตว์มีแกนสันหลัง)
Class	Chondrichthyes (ปลากระดูกอ่อน)	Mammalia (สัตว์เลี้ยงลูกด้วยน้ำนม)
Order	Lamniformes (อันดับปลาฉลามขาว)	Cetacea (Whales & Dolphins)
Family	Rhincodontidae (Whale Sharks)	Balaenopteridae (Rorquals)
Genus	Rhincodon (Whale Sharks)	Balaenoptera (Rorquals)
Species	Rhincodon typus	Balaenoptera musculus

Evolutionary Relationship

Basking shark and blue whale share a common ancestor at the Phylum level: Chordata. (สัตว์มีแกนสันหลัง)

Conservation Status

Basking shark

EN — Endangered

Trend: Decreasing ↓

blue whale

VU — Vulnerable

Population: ~15.0K

Trend: Increasing ↑

Physical Characteristics

Attribute	Basking shark	blue whale
Diet	Omnivore	Carnivore
Average Lifespan	100 years	90 years
Average Length	12.0 m	30.0 m
Average Weight	20.0 t	150.0 t

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.

blue whale

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

Range

Widely distributed across Asia (Taiwan), Europe (4 countries), and South America (Colombia, Ecuador). 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.

blue whale

The largest animal ever known to have lived on Earth, blue whales can reach 33 meters and 200 tonnes — their hearts alone weigh as much as a small car. Found in all oceans, they migrate between polar feeding grounds and tropical breeding areas. Filter feeders consuming up to 4 tonnes of krill daily. Endangered, with global populations estimated at 10,000–25,000 after near-extinction from 20th-century whaling.

Shared Countries

Both species can be found in 2 countries:

🇵🇹 Portugal 🇹🇼 Taiwan