Hooded seal vs Ruff

Cystophora cristata compared with Calidris pugnax

Key Differences

• Hooded seal is Endangered while Ruff is Least Concern.

Taxonomic Classification

Rank	Hooded seal	Ruff
Kingdom same	Animalia (動物)	Animalia (動物)
Phylum same	Chordata (脊索動物)	Chordata (脊索動物)
Class	Mammalia (哺乳類)	Aves (鳥類)
Order	Pinnipedia (Seals & Sea Lions)	Charadriiformes (チドリ目)
Family	Phocidae (True Seals)	Scolopacidae
Genus	Cystophora	Calidris
Species	Cystophora cristata	Calidris pugnax

Evolutionary Relationship

Hooded seal and Ruff share a common ancestor at the Phylum level: Chordata. (脊索動物)

Conservation Status

Hooded seal

EN — Endangered

Ruff

LC — Least Concern

Physical Characteristics

Attribute	Hooded seal	Ruff
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Hooded seal

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

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

Ruff

Habitat

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

Range

Widely distributed across Asia (Taiwan), Europe (4 countries), North America (United States), and South America (Colombia, Venezuela).

Ruff

Ruff（Calidris pugnax）は IUCN レッドリストで軽度懸念（LC）に分類されている。分布域全体に広く分布し個体数も豊富で、個体群は安定しており差し迫った保全上の懸念はない。

Shared Countries

Both species can be found in 2 countries:

🇩🇰 Denmark 🇳🇴 Norway