Речная крачка vs Gray-shanked Douc Langur

Sterna hirundo compared with Pygathrix cinerea

Key Differences

• Речная крачка is Endangered while Gray-shanked Douc Langur is Critically Endangered.

Taxonomic Classification

Rank	Речная крачка	Gray-shanked Douc Langur
Kingdom same	Animalia (животные)	Animalia (животные)
Phylum same	Chordata (хордовые)	Chordata (хордовые)
Class	Aves (птицы)	Mammalia (млекопитающие)
Order	Charadriiformes (ржанкообразные)	Primates (приматы)
Family	Laridae	Cercopithecidae (Old World Monkeys)
Genus	Sterna	Pygathrix
Species	Sterna hirundo	Pygathrix cinerea

Evolutionary Relationship

Речная крачка and Gray-shanked Douc Langur share a common ancestor at the Phylum level: Chordata. (хордовые)

Conservation Status

Речная крачка

EN — Endangered

Gray-shanked Douc Langur

CR — Critically Endangered

Physical Characteristics

Attribute	Речная крачка	Gray-shanked Douc Langur
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Речная крачка

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.

Gray-shanked Douc Langur

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Речная крачка

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.