Bigeye thresher vs Black-naped Tern

Alopias pelagicus compared with Sterna sumatrana

Key Differences

• Bigeye thresher is Endangered while Black-naped Tern is Least Concern.

Taxonomic Classification

Rank	Bigeye thresher	Black-naped 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 sumatrana

Evolutionary Relationship

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

Conservation Status

Bigeye thresher

EN — Endangered

Black-naped Tern

LC — Least Concern

Physical Characteristics

Attribute	Bigeye thresher	Black-naped 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.

Black-naped Tern

Habitat

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

Range

Found in Norway.

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.

Black-naped Tern

The Black-naped Tern (Sterna sumatrana) is a species in the genus Sterna. It is currently classified as Least Concern on the IUCN Red List. Typically found in various aerial, terrestrial, and aquatic environments.