Black-headed Gull vs Brown-headed Gull

Chroicocephalus ridibundus compared with Chroicocephalus brunnicephalus

Key Differences

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

Taxonomic Classification

Rank	Black-headed Gull	Brown-headed 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 brunnicephalus

Evolutionary Relationship

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

Conservation Status

Black-headed Gull

VU — Vulnerable

Brown-headed Gull

NE — Not Evaluated

Physical Characteristics

Attribute	Black-headed Gull	Brown-headed 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.

Brown-headed Gull

Habitat

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

Range

Distributed across Norway 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.

Brown-headed Gull

The Brown-headed Gull (Chroicocephalus brunnicephalus) is a species in the genus Chroicocephalus. Typically found in various aerial, terrestrial, and aquatic environments. Distributed across Norway and Taiwan.

Shared Countries

Both species can be found in 2 countries:

🇳🇴 Norway 🇹🇼 Taiwan