European otter vs Great Blue/Cocoi Heron

Lutra lutra compared with Ardea herodias

Key Differences

• European otter is Vulnerable while Great Blue/Cocoi Heron is Least Concern.

Taxonomic Classification

Rank	European otter	Great Blue/Cocoi Heron
Kingdom same	Animalia (động vật)	Animalia (động vật)
Phylum same	Chordata (động vật có dây sống)	Chordata (động vật có dây sống)
Class	Mammalia (lớp Thú)	Aves (chim)
Order	Carnivora (bộ Ăn thịt)	Pelecaniformes (bộ Bồ nông)
Family	Mustelidae (Weasels & Otters)	Ardeidae
Genus	Lutra (Otters)	Ardea
Species	Lutra lutra	Ardea herodias

Evolutionary Relationship

European otter and Great Blue/Cocoi Heron share a common ancestor at the Phylum level: Chordata. (động vật có dây sống)

Conservation Status

European otter

VU — Vulnerable

Trend: Stable →

Great Blue/Cocoi Heron

LC — Least Concern

Physical Characteristics

Attribute	European otter	Great Blue/Cocoi Heron
Diet	Carnivore	—
Average Lifespan	10 years	—
Average Length	1.0 m	—
Average Weight	10.0 kg	—

Habitat & Geographic Range

European otter

Habitat

Typically found in diverse ecosystems where prey species are available.

Range

Found across Europe (6 countries). Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Great Blue/Cocoi Heron

Habitat

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

Range

Widely distributed across Europe (5 countries), North America (United States), and South America (Colombia, Ecuador, Venezuela).

European otter

Sleek semi-aquatic mustelid found along clean rivers, streams, and coastlines across Europe and Asia. European otters can reach 1.3 meters in length and are highly skilled fish hunters, using sensitive whiskers to detect prey movements. Requiring unpolluted water with abundant fish, they are an indicator species for freshwater ecosystem health. Once nearly extinct in Western Europe from hunting and pollution, populations have recovered significantly following water quality improvements.

Great Blue/Cocoi Heron

Great Blue/Cocoi Heron (Ardea herodias) is classified as Least Concern (LC) on the IUCN Red List. Widespread and abundant across its range, with stable populations and no immediate conservation concerns.

Shared Countries

Both species can be found in 2 countries:

🇧🇪 Belgium 🇳🇴 Norway