Atlantic Gray Seal vs Greater Crested Tern

Halichoerus grypus compared with Thalasseus bergii

Key Differences

• Atlantic Gray Seal is Vulnerable while Greater Crested Tern is Least Concern.

Taxonomic Classification

Rank	Atlantic Gray Seal	Greater Crested Tern
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Mammalia (Mammals)	Aves (Birds)
Order	Pinnipedia (Seals & Sea Lions)	Charadriiformes (Charadriiformes)
Family	Phocidae (True Seals)	Laridae
Genus	Halichoerus	Thalasseus
Species	Halichoerus grypus	Thalasseus bergii

Evolutionary Relationship

Atlantic Gray Seal and Greater Crested Tern share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Atlantic Gray Seal

VU — Vulnerable

Greater Crested Tern

LC — Least Concern

Physical Characteristics

Attribute	Atlantic Gray Seal	Greater Crested Tern
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Atlantic Gray Seal

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Distributed across Belgium, Denmark, Norway, Portugal, and Sweden. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Greater Crested Tern

Habitat

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

Range

Found in Norway.

Atlantic Gray Seal

The Atlantic Gray Seal (Halichoerus grypus) is a species in the genus Halichoerus. It is currently classified as Vulnerable on the IUCN Red List. Typically found in diverse terrestrial and aquatic ecosystems.

Shared Countries

Both species can be found in 1 countries:

🇳🇴 Norway