Common Tern vs Delacour's langur

Sterna hirundo compared with Trachypithecus delacouri

Key Differences

• Common Tern is Endangered while Delacour's langur is Critically Endangered.

Taxonomic Classification

Rank	Common Tern	Delacour's langur
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Aves (Birds)	Mammalia (Mammals)
Order	Charadriiformes (Charadriiformes)	Primates (Primates)
Family	Laridae	Cercopithecidae (Old World Monkeys)
Genus	Sterna	Trachypithecus
Species	Sterna hirundo	Trachypithecus delacouri

Evolutionary Relationship

Common Tern and Delacour's langur share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Common Tern

EN — Endangered

Delacour's langur

CR — Critically Endangered

Physical Characteristics

Attribute	Common Tern	Delacour's langur
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Common Tern

Habitat

Found across multiple habitat types including tropical and subtropical dry broadleaf forests, flooded grasslands and savannas, and montane grasslands and shrublands, among 9 distinct biome types spanning the Neotropic and Palearctic realms. Populations are also found in montane and highland environments at higher elevations.

Range

Widely distributed across Europe (7 countries), North America (United States), and South America (Colombia, Ecuador, Venezuela). Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Delacour's langur

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Common Tern

Common Tern (Sterna hirundo) 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.