Hourglass Dolphin vs River Tern

Lagenorhynchus cruciger compared with Sterna aurantia

Key Differences

• Hourglass Dolphin is Least Concern while River Tern is Vulnerable.

Taxonomic Classification

Rank	Hourglass Dolphin	River Tern
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Mammalia (Mammals)	Aves (Birds)
Order	Cetacea (Whales & Dolphins)	Charadriiformes (Charadriiformes)
Family	Delphinidae (Oceanic Dolphins)	Laridae
Genus	Lagenorhynchus	Sterna
Species	Lagenorhynchus cruciger	Sterna aurantia

Evolutionary Relationship

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

Conservation Status

Hourglass Dolphin

LC — Least Concern

River Tern

VU — Vulnerable

Physical Characteristics

Attribute	Hourglass Dolphin	River Tern
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Hourglass Dolphin

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

River Tern

Habitat

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

Range

Found in Norway. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.