Common Loon vs Hourglass Dolphin

Gavia immer compared with Lagenorhynchus cruciger

Key Differences

• Common Loon is Not Evaluated while Hourglass Dolphin is Least Concern.

Taxonomic Classification

Rank	Common Loon	Hourglass Dolphin
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Aves (Birds)	Mammalia (Mammals)
Order	Gaviiformes (Gaviiformes)	Cetacea (Whales & Dolphins)
Family	Gaviidae	Delphinidae (Oceanic Dolphins)
Genus	Gavia	Lagenorhynchus
Species	Gavia immer	Lagenorhynchus cruciger

Evolutionary Relationship

Common Loon and Hourglass Dolphin share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Common Loon

NE — Not Evaluated

Hourglass Dolphin

LC — Least Concern

Physical Characteristics

Attribute	Common Loon	Hourglass Dolphin
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Common Loon

Habitat

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

Range

Distributed across Belgium, Denmark, Norway, Sweden, and United States.

Hourglass Dolphin

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Common Loon

<em>Gavia immer</em>, the common loon or great northern diver, is a large aquatic bird in the family Gaviidae, known for its haunting, yodeling calls across northern lakes. It is found in Belgium, Denmark, Norway, Sweden, and the United States, breeding on freshwater lakes in boreal and subarctic regions and wintering along marine coastlines. The common loon is adept in aerial, terrestrial, and aquatic environments, though it is most highly specialized for diving, using its strong feet positioned far back on its body to pursue fish underwater. It typically feeds on fish, supplemented by crustaceans and aquatic invertebrates. Its striking summer plumage features a black-and-white checkered back and a deep black head with a characteristic white necklace pattern. The species has not been evaluated for IUCN conservation status. Common loons require clear, fish-rich lakes for successful breeding and are sensitive to water quality degradation and human disturbance at nesting sites. Their distinctive calls are emblematic of wilderness in North America and Scandinavia.