Pacific white-sided dolphin vs sei whale

Lagenorhynchus obliquidens compared with Balaenoptera borealis

Key Differences

• Pacific white-sided dolphin is Least Concern while sei whale is Endangered.

Taxonomic Classification

Rank	Pacific white-sided dolphin	sei whale
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class same	Mammalia (Mammals)	Mammalia (Mammals)
Order same	Cetacea (Whales & Dolphins)	Cetacea (Whales & Dolphins)
Family	Delphinidae (Oceanic Dolphins)	Balaenopteridae (Rorquals)
Genus	Lagenorhynchus	Balaenoptera (Rorquals)
Species	Lagenorhynchus obliquidens	Balaenoptera borealis

Evolutionary Relationship

Pacific white-sided dolphin and sei whale share a common ancestor at the Order level: Cetacea. (Whales & Dolphins)

Conservation Status

Pacific white-sided dolphin

LC — Least Concern

sei whale

EN — Endangered

Physical Characteristics

Attribute	Pacific white-sided dolphin	sei whale
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Pacific white-sided dolphin

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

sei whale

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Widely distributed across Asia (Taiwan), Europe (4 countries), and South America (Colombia, Ecuador). Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.