Amazon River Dolphin vs Big Finner

Inia geoffrensis compared with Balaenoptera physalus

Key Differences

Amazon River Dolphin is Data Deficient while Big Finner is Endangered.

Taxonomic Classification

Rank	Amazon River Dolphin	Big Finner
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	Iniidae	Balaenopteridae (Rorquals)
Genus	Inia	Balaenoptera (Rorquals)
Species	Inia geoffrensis	Balaenoptera physalus

Evolutionary Relationship

Amazon River Dolphin and Big Finner share a common ancestor at the Order level: Cetacea. (Whales & Dolphins)

View Order: Cetacea

Conservation Status

Amazon River Dolphin

DD — Data Deficient

Big Finner

EN — Endangered

Physical Characteristics

Attribute	Amazon River Dolphin	Big Finner
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Amazon River Dolphin

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Distributed across Colombia, Ecuador, and Venezuela.

Big Finner

Habitat

Found across multiple habitat types including tropical and subtropical dry broadleaf forests, flooded grasslands and savannas, and montane grasslands and shrublands, among 4 distinct biome types within the Neotropic biogeographic realm.

Range

Widely distributed across Asia (Taiwan), Europe (5 countries), and South America (Colombia, Ecuador, Venezuela). Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Amazon River Dolphin

The Amazon River Dolphin (Inia geoffrensis) is a species in the genus Inia. Its conservation status is listed as Data Deficient, indicating insufficient data for assessment. Typically found in diverse terrestrial and aquatic ecosystems.

Big Finner

Big Finner (Balaenoptera physalus) is classified as Endangered (EN) on the IUCN Red List. At high risk of extinction in the wild, with significant population decline and ongoing threats to survival.