Common Merganser vs Perija Small-eared Shrew

Mergus merganser compared with Cryptotis perijensis

Key Differences

• Common Merganser is Least Concern while Perija Small-eared Shrew is Data Deficient.

Taxonomic Classification

Rank	Common Merganser	Perija Small-eared Shrew
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Aves (Birds)	Mammalia (Mammals)
Order	Anseriformes (Anseriformes)	Soricomorpha (Soricomorpha)
Family	Anatidae	Soricidae
Genus	Mergus	Cryptotis
Species	Mergus merganser	Cryptotis perijensis

Evolutionary Relationship

Common Merganser and Perija Small-eared Shrew share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Common Merganser

LC — Least Concern

Perija Small-eared Shrew

DD — Data Deficient

Physical Characteristics

Attribute	Common Merganser	Perija Small-eared Shrew
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Common Merganser

Habitat

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

Range

Found across Europe (5 countries) and North America (United States).

Perija Small-eared Shrew

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Found in Colombia.

Common Merganser

<em>Mergus merganser</em>, the common merganser or goosander, is a large diving duck in the family Anatidae, broadly distributed across Europe and North America. It is classified as Least Concern on the IUCN Red List. This species is capable of aerial, terrestrial, and aquatic locomotion, but is most specialized for underwater pursuit of prey. The common merganser is typically piscivorous, diving in clear, fast-flowing rivers and lakes to catch fish using its serrated bill, which provides a firm grip on slippery prey. Males display striking breeding plumage with a dark green head, white body, and red bill, while females are grey with a rusty-brown head and crested nape. The species nests in tree cavities, cliff ledges, and artificial nest boxes near freshwater habitats. It requires clean, well-oxygenated rivers and lakes for foraging, making it sensitive to water quality degradation and overfishing of prey species. Common mergansers are migratory in northern parts of their range, moving to coastal and ice-free inland waters during winter months.