Bigeye thresher vs Irrawaddy dolphin

Alopias pelagicus compared with Orcaella brevirostris

Taxonomic Classification

Rank	Bigeye thresher	Irrawaddy dolphin
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Chondrichthyes (Cartilaginous Fish)	Mammalia (Mammals)
Order	Lamniformes (Mackerel Sharks)	Cetacea (Whales & Dolphins)
Family	Alopiidae	Delphinidae (Oceanic Dolphins)
Genus	Alopias	Orcaella
Species	Alopias pelagicus	Orcaella brevirostris

Evolutionary Relationship

Bigeye thresher and Irrawaddy dolphin share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Bigeye thresher

EN — Endangered

Irrawaddy dolphin

EN — Endangered

Physical Characteristics

Attribute	Bigeye thresher	Irrawaddy dolphin
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Bigeye thresher

Habitat

Typically found in marine environments from coastal waters to deep ocean.

Range

Distributed across Colombia and Taiwan. Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Irrawaddy dolphin

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Bigeye thresher

The Bigeye thresher (Alopias pelagicus) is a species in the genus Alopias. It is currently classified as Endangered on the IUCN Red List. Typically found in marine environments from coastal waters to deep ocean.