Common Murre vs Gallagher's Free-tailed Bat

Uria aalge compared with Chaerephon gallagheri

Key Differences

• Common Murre is Critically Endangered while Gallagher's Free-tailed Bat is Data Deficient.

Taxonomic Classification

Rank	Common Murre	Gallagher's Free-tailed Bat
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Aves (Birds)	Mammalia (Mammals)
Order	Charadriiformes (Charadriiformes)	Chiroptera (Bats)
Family	Alcidae	Molossidae
Genus	Uria	Chaerephon
Species	Uria aalge	Chaerephon gallagheri

Evolutionary Relationship

Common Murre and Gallagher's Free-tailed Bat share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Common Murre

CR — Critically Endangered

Gallagher's Free-tailed Bat

DD — Data Deficient

Physical Characteristics

Attribute	Common Murre	Gallagher's Free-tailed Bat
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Common Murre

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.

Gallagher's Free-tailed Bat

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Common Murre

<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.