Flussseeschwalbe vs Graureiher

Sterna hirundo compared with Ardea cinerea

Key Differences

• Flussseeschwalbe is Endangered while Graureiher is Least Concern.

Taxonomic Classification

Rank	Flussseeschwalbe	Graureiher
Kingdom same	Animalia (Tier)	Animalia (Tier)
Phylum same	Chordata (Chordatiere)	Chordata (Chordatiere)
Class same	Aves (Vögel)	Aves (Vögel)
Order	Charadriiformes (Regenpfeiferartige)	Pelecaniformes (Pelecaniformes)
Family	Laridae	Ardeidae
Genus	Sterna	Ardea
Species	Sterna hirundo	Ardea cinerea

Evolutionary Relationship

Flussseeschwalbe and Graureiher share a common ancestor at the Class level: Aves. (Vögel)

Conservation Status

Flussseeschwalbe

EN — Endangered

Graureiher

LC — Least Concern

Trend: Stable →

Physical Characteristics

Attribute	Flussseeschwalbe	Graureiher
Diet	—	Carnivore
Average Lifespan	—	15 years
Average Length	—	95 cm
Average Weight	—	1.5 kg

Habitat & Geographic Range

Flussseeschwalbe

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.

Graureiher

Habitat

Typically found in diverse ecosystems where prey species are available.

Range

Found across Europe (6 countries).

Flussseeschwalbe

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.

Graureiher

A large, elegant wading bird reaching up to 1 meter in height, gray herons inhabit wetlands, rivers, lakes, and coastal areas across Europe, Asia, and Africa. Patient, solitary hunters, they stand motionless for long periods before striking fish, frogs, and small mammals with lightning-fast dagger bill strikes. They nest colonially in tall trees in rookeries called heronries, sometimes shared with other colonial waterbirds. Widely distributed and of Least Concern globally.

Shared Countries

Both species can be found in 6 countries:

🇧🇪 Belgium 🇩🇰 Denmark 🇱🇺 Luxembourg 🇳🇴 Norway 🇷🇺 Russia 🇸🇪 Sweden