Речная крачка vs Желтоклювый чёрный кассик

Sterna hirundo compared with Amblycercus holosericeus

Key Differences

• Речная крачка is Endangered while Желтоклювый чёрный кассик is Least Concern.

Taxonomic Classification

Rank	Речная крачка	Желтоклювый чёрный кассик
Kingdom same	Animalia (животные)	Animalia (животные)
Phylum same	Chordata (хордовые)	Chordata (хордовые)
Class same	Aves (птицы)	Aves (птицы)
Order	Charadriiformes (ржанкообразные)	Passeriformes (воробьинообразные)
Family	Laridae	Icteridae
Genus	Sterna	Amblycercus
Species	Sterna hirundo	Amblycercus holosericeus

Evolutionary Relationship

Речная крачка and Желтоклювый чёрный кассик share a common ancestor at the Class level: Aves. (птицы)

Conservation Status

Речная крачка

EN — Endangered

Желтоклювый чёрный кассик

LC — Least Concern

Physical Characteristics

Attribute	Речная крачка	Желтоклювый чёрный кассик
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.

Желтоклювый чёрный кассик

Habitat

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

Range

Distributed across Colombia, Ecuador, Norway, and Venezuela.

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.

Желтоклювый чёрный кассик

Yellow-billed Cacique (Amblycercus holosericeus) is classified as Least Concern (LC) on the IUCN Red List. Widespread and abundant across its range, with stable populations and no immediate conservation concerns.

Shared Countries

Both species can be found in 4 countries:

🇨🇴 Colombia 🇪🇨 Ecuador 🇳🇴 Norway 🇻🇪 Venezuela