Big Finner vs Peale’s Free-tailed Bat

Balaenoptera physalus compared with Nyctinomops aurispinosus

Key Differences

• Big Finner is Endangered while Peale’s Free-tailed Bat is Least Concern.

Taxonomic Classification

Rank	Big Finner	Peale’s Free-tailed Bat
Kingdom same	Animalia (động vật)	Animalia (động vật)
Phylum same	Chordata (động vật có dây sống)	Chordata (động vật có dây sống)
Class same	Mammalia (lớp Thú)	Mammalia (lớp Thú)
Order	Cetacea (Whales & Dolphins)	Chiroptera (bộ Dơi)
Family	Balaenopteridae (Rorquals)	Molossidae
Genus	Balaenoptera (Rorquals)	Nyctinomops
Species	Balaenoptera physalus	Nyctinomops aurispinosus

Evolutionary Relationship

Big Finner and Peale’s Free-tailed Bat share a common ancestor at the Class level: Mammalia. (lớp Thú)

Conservation Status

Big Finner

EN — Endangered

Peale’s Free-tailed Bat

LC — Least Concern

Physical Characteristics

Attribute	Big Finner	Peale’s Free-tailed Bat
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

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.

Peale’s Free-tailed Bat

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Distributed across Colombia and Venezuela.

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.

Shared Countries

Both species can be found in 2 countries:

🇨🇴 Colombia 🇻🇪 Venezuela