Black-headed Gull vs Slender-billed Gull

Chroicocephalus ridibundus compared with Chroicocephalus genei

Key Differences

• Black-headed Gull is Vulnerable while Slender-billed Gull is Not Evaluated.

Taxonomic Classification

Rank	Black-headed Gull	Slender-billed Gull
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class same	Aves (Birds)	Aves (Birds)
Order same	Charadriiformes (Charadriiformes)	Charadriiformes (Charadriiformes)
Family same	Laridae	Laridae
Genus same	Chroicocephalus	Chroicocephalus
Species	Chroicocephalus ridibundus	Chroicocephalus genei

Evolutionary Relationship

Black-headed Gull and Slender-billed Gull share a common ancestor at the Genus level: Chroicocephalus.

Conservation Status

Black-headed Gull

VU — Vulnerable

Slender-billed Gull

NE — Not Evaluated

Physical Characteristics

Attribute	Black-headed Gull	Slender-billed Gull
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Black-headed Gull

Habitat

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

Range

Widely distributed across Asia (Taiwan), Europe (4 countries), North America (United States), and South America (Colombia, Venezuela). Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Slender-billed Gull

Habitat

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

Range

Distributed across Belgium, Denmark, Norway, Sweden, and Taiwan.

Black-headed Gull

Black-headed Gull (Chroicocephalus ridibundus) is classified as Vulnerable (VU) on the IUCN Red List. Facing a high risk of endangerment in the wild, with declining populations and increasing habitat pressure.

Shared Countries

Both species can be found in 5 countries:

🇧🇪 Belgium 🇩🇰 Denmark 🇳🇴 Norway 🇸🇪 Sweden 🇹🇼 Taiwan