Тонкоклювая кайра vs Толстоклювая кайра

Uria aalge compared with Uria lomvia

Key Differences

• Тонкоклювая кайра is Critically Endangered while Толстоклювая кайра is Endangered.

Taxonomic Classification

Rank	Тонкоклювая кайра	Толстоклювая кайра
Kingdom same	Animalia (животные)	Animalia (животные)
Phylum same	Chordata (хордовые)	Chordata (хордовые)
Class same	Aves (птицы)	Aves (птицы)
Order same	Charadriiformes (ржанкообразные)	Charadriiformes (ржанкообразные)
Family same	Alcidae	Alcidae
Genus same	Uria	Uria
Species	Uria aalge	Uria lomvia

Evolutionary Relationship

Тонкоклювая кайра and Толстоклювая кайра share a common ancestor at the Genus level: Uria.

Conservation Status

Тонкоклювая кайра

CR — Critically Endangered

Толстоклювая кайра

EN — Endangered

Physical Characteristics

Attribute	Тонкоклювая кайра	Толстоклювая кайра
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Тонкоклювая кайра

Habitat

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

Range

Distributed across Belgium, Denmark, Norway, Sweden, and United States. Currently classified as Critically Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Толстоклювая кайра

Habitat

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

Range

Distributed across Belgium, Denmark, Norway, Sweden, and United States. Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Тонкоклювая кайра

<em>Uria aalge</em>, the common murre or common guillemot, is a seabird in the family Alcidae found across the North Atlantic and North Pacific Oceans. This colonial cliff-nesting bird typically breeds on rocky coastal ledges and sea stacks, often in dense aggregations that may number in the thousands. <em>Uria aalge</em> is a highly capable diver, using its wings to propel itself underwater in pursuit of fish, sand eels, and invertebrates. It is found in coastal and offshore marine waters during the non-breeding season, ranging across the northern seas. Recorded occurrence countries include Belgium, Denmark, Norway, Sweden, and the United States. Despite its wide distribution and historically large numbers, the common murre is currently assessed as Critically Endangered in certain regional contexts, with populations threatened by oil spills, bycatch in fishing nets, food web disruptions linked to climate change, and disturbance at breeding colonies. Biological traits such as lifespan, body size, and diet remain poorly documented at the population level for this species across its full range, though it is known to be a piscivore. The species is a key indicator of marine ecosystem health and a focus of ongoing seabird conservation efforts.

Shared Countries

Both species can be found in 5 countries:

🇧🇪 Belgium 🇩🇰 Denmark 🇳🇴 Norway 🇸🇪 Sweden 🇺🇸 United States