Bigeye thresher vs Cave Swiftlet

Alopias pelagicus compared with Collocalia linchi

Key Differences

• Bigeye thresher is Endangered while Cave Swiftlet is Least Concern.

Taxonomic Classification

Rank	Bigeye thresher	Cave Swiftlet
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Chondrichthyes (Cartilaginous Fish)	Aves (Birds)
Order	Lamniformes (Mackerel Sharks)	Apodiformes (Apodiformes)
Family	Alopiidae	Apodidae
Genus	Alopias	Collocalia
Species	Alopias pelagicus	Collocalia linchi

Evolutionary Relationship

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

Conservation Status

Bigeye thresher

EN — Endangered

Cave Swiftlet

LC — Least Concern

Physical Characteristics

Attribute	Bigeye thresher	Cave Swiftlet
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.

Cave Swiftlet

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.

Cave Swiftlet

The Cave Swiftlet (Collocalia linchi) is a species in the genus Collocalia. It is currently classified as Least Concern on the IUCN Red List. Typically found in various aerial, terrestrial, and aquatic environments.