Black-billed Gull vs Black-headed Gull

Chroicocephalus bulleri compared with Chroicocephalus ridibundus

Key Differences

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

Taxonomic Classification

Rank	Black-billed Gull	Black-headed Gull
Kingdom same	Animalia (hayvan)	Animalia (hayvan)
Phylum same	Chordata (Kordalılar)	Chordata (Kordalılar)
Class same	Aves (kuş)	Aves (kuş)
Order same	Charadriiformes (Yağmur kuşları)	Charadriiformes (Yağmur kuşları)
Family same	Laridae	Laridae
Genus same	Chroicocephalus	Chroicocephalus
Species	Chroicocephalus bulleri	Chroicocephalus ridibundus

Evolutionary Relationship

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

Conservation Status

Black-billed Gull

NE — Not Evaluated

Black-headed Gull

VU — Vulnerable

Physical Characteristics

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

Habitat & Geographic Range

Black-billed Gull

Habitat

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

Range

Found in Norway.

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.

Black-billed Gull

The Black-billed Gull (Chroicocephalus bulleri) is a species in the genus Chroicocephalus. Typically found in various aerial, terrestrial, and aquatic environments.

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 1 countries:

🇳🇴 Norway