Bigeye thresher vs River Tern

Alopias pelagicus compared with Sterna aurantia

Key Differences

• Bigeye thresher is Endangered while River Tern is Vulnerable.

Taxonomic Classification

Rank	Bigeye thresher	River Tern
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Chondrichthyes (Cartilaginous Fish)	Aves (Birds)
Order	Lamniformes (Mackerel Sharks)	Charadriiformes (Charadriiformes)
Family	Alopiidae	Laridae
Genus	Alopias	Sterna
Species	Alopias pelagicus	Sterna aurantia

Evolutionary Relationship

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

Conservation Status

Bigeye thresher

EN — Endangered

River Tern

VU — Vulnerable

Physical Characteristics

Attribute	Bigeye thresher	River Tern
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.

River Tern

Habitat

Typically found in various aerial, terrestrial, and aquatic environments.

Range

Found in Norway. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

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.