Allen s Swamp Monkey vs Eurasian Eagle-Owl

Allenopithecus nigroviridis compared with Bubo bubo

Key Differences

• Allen s Swamp Monkey is Least Concern while Eurasian Eagle-Owl is Endangered.

Taxonomic Classification

Rank	Allen s Swamp Monkey	Eurasian Eagle-Owl
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Mammalia (Mammals)	Aves (Birds)
Order	Primates (Primates)	Strigiformes (Owls)
Family	Cercopithecidae (Old World Monkeys)	Strigidae (True Owls)
Genus	Allenopithecus	Bubo (Eagle Owls)
Species	Allenopithecus nigroviridis	Bubo bubo

Evolutionary Relationship

Allen s Swamp Monkey and Eurasian Eagle-Owl share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Allen s Swamp Monkey

LC — Least Concern

Eurasian Eagle-Owl

EN — Endangered

Population: ~400.0K

Trend: Stable →

Physical Characteristics

Attribute	Allen s Swamp Monkey	Eurasian Eagle-Owl
Diet	—	Carnivore
Average Lifespan	—	20 years
Average Length	—	70 cm
Average Weight	—	3.0 kg

Habitat & Geographic Range

Allen s Swamp Monkey

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Eurasian Eagle-Owl

Habitat

Found across multiple habitat types including tropical and subtropical dry broadleaf forests, flooded grasslands and savannas, and montane grasslands and shrublands, among 4 distinct biome types within the Neotropic biogeographic realm.

Range

Found across Europe (9 countries) and South America (Ecuador). Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Allen s Swamp Monkey

The Allen s Swamp Monkey (Allenopithecus nigroviridis) is a species in the genus Allenopithecus. It is currently classified as Least Concern on the IUCN Red List. Typically found in diverse terrestrial and aquatic ecosystems.

Eurasian Eagle-Owl

The world's largest owl species by height and weight, Eurasian eagle-owls have wingspans up to 1.9 meters and inhabit rocky landscapes, forest edges, and cliffs from Europe across Asia to China. Silent nocturnal hunters with powerful talons, they prey on rabbits, hares, foxes, and even other raptors. Their deep, resonant hooting carries over great distances. Relatively stable in population, though persecuted historically.