Amazon Black Howler vs Ray's Knotgrass

Alouatta nigerrima compared with Polygonum oxyspermum

Key Differences

• Amazon Black Howler is Least Concern while Ray's Knotgrass is Endangered.

Taxonomic Classification

Rank	Amazon Black Howler	Ray's Knotgrass
Kingdom	Animalia (Animals)	Plantae (Plants)
Phylum	Chordata (Chordates)	Magnoliophyta (Flowering Plants)
Class	Mammalia (Mammals)	Magnoliopsida (Dicots)
Order	Primates (Primates)	Caryophyllales (Caryophyllales)
Family	Atelidae	Polygonaceae
Genus	Alouatta	Polygonum
Species	Alouatta nigerrima	Polygonum oxyspermum

Conservation Status

Amazon Black Howler

LC — Least Concern

Ray's Knotgrass

EN — Endangered

Physical Characteristics

Attribute	Amazon Black Howler	Ray's Knotgrass
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Amazon Black Howler

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Ray's Knotgrass

Habitat

Typically found in diverse terrestrial habitats from tropical forests to temperate regions.

Range

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

Amazon Black Howler

The Amazon Black Howler (Alouatta nigerrima) is a species in the genus Alouatta. It is currently classified as Least Concern on the IUCN Red List. Typically found in diverse terrestrial and aquatic ecosystems.