Cay Sua vs Common Tern

Alstonia scholaris compared with Sterna hirundo

Key Differences

Cay Sua is Least Concern while Common Tern is Endangered.

Taxonomic Classification

Rank	Cay Sua	Common Tern
Kingdom	Plantae (thực vật)	Animalia (động vật)
Phylum	Magnoliophyta (Flowering Plants)	Chordata (động vật có dây sống)
Class	Magnoliopsida (Dicots)	Aves (chim)
Order	Gentianales (Bộ Long đởm)	Charadriiformes (Bộ Choi choi)
Family	Apocynaceae	Laridae
Genus	Alstonia	Sterna
Species	Alstonia scholaris	Sterna hirundo

Conservation Status

Cay Sua

LC — Least Concern

Common Tern

EN — Endangered

Physical Characteristics

Attribute	Cay Sua	Common Tern
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Cay Sua

Habitat

Inhabits tropical and subtropical moist broadleaf forests and tropical and subtropical dry broadleaf forests within the Oceanian biogeographic realm.

Range

Distributed across Micronesia, Taiwan, and United States.

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.

Cay Sua

The Blackboard Tree (Alstonia scholaris) is a species in the genus Alstonia. It is currently classified as Least Concern on the IUCN Red List. Inhabits tropical and subtropical moist broadleaf forests and tropical and subtropical dry broadleaf forests within the Oceanian biogeographic realm.

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.