River Tern vs small tortoiseshell

Sterna aurantia compared with Aglais urticae

Key Differences

• River Tern is Vulnerable while small tortoiseshell is Near Threatened.

Taxonomic Classification

Rank	River Tern	small tortoiseshell
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Chordata (Chordates)	Arthropoda (Arthropods)
Class	Aves (Birds)	Insecta (Insects)
Order	Charadriiformes (Charadriiformes)	Lepidoptera (Butterflies & Moths)
Family	Laridae	Nymphalidae (Brush-footed Butterflies)
Genus	Sterna	Aglais
Species	Sterna aurantia	Aglais urticae

Evolutionary Relationship

River Tern and small tortoiseshell share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

River Tern

VU — Vulnerable

small tortoiseshell

NT — Near Threatened

Physical Characteristics

Attribute	River Tern	small tortoiseshell
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

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.

small tortoiseshell

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Found across Europe (41 countries). Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

small tortoiseshell

small tortoiseshell (Aglais urticae) is classified as Near Threatened (NT) on the IUCN Red List. Close to qualifying as threatened, with populations that may become vulnerable without conservation action.

Shared Countries

Both species can be found in 1 countries:

🇳🇴 Norway