Allen's Big-eared Bat vs Big Finner

Idionycteris phyllotis compared with Balaenoptera physalus

Key Differences

• Allen's Big-eared Bat is Least Concern while Big Finner is Endangered.

Taxonomic Classification

Rank	Allen's Big-eared Bat	Big Finner
Kingdom same	Animalia (สัตว์)	Animalia (สัตว์)
Phylum same	Chordata (สัตว์มีแกนสันหลัง)	Chordata (สัตว์มีแกนสันหลัง)
Class same	Mammalia (สัตว์เลี้ยงลูกด้วยน้ำนม)	Mammalia (สัตว์เลี้ยงลูกด้วยน้ำนม)
Order	Chiroptera (ค้างคาว)	Cetacea (Whales & Dolphins)
Family	Vespertilionidae	Balaenopteridae (Rorquals)
Genus	Idionycteris	Balaenoptera (Rorquals)
Species	Idionycteris phyllotis	Balaenoptera physalus

Evolutionary Relationship

Allen's Big-eared Bat and Big Finner share a common ancestor at the Class level: Mammalia. (สัตว์เลี้ยงลูกด้วยน้ำนม)

Conservation Status

Allen's Big-eared Bat

LC — Least Concern

Big Finner

EN — Endangered

Physical Characteristics

Attribute	Allen's Big-eared Bat	Big Finner
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Allen's Big-eared Bat

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

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.

Allen's Big-eared Bat

The Allen's Big-eared Bat (Idionycteris phyllotis) is a species in the genus Idionycteris. It is currently classified as Least Concern on the IUCN Red List. 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.