Greater Rhea vs Lesser Rhea

Rhea americana compared with Rhea pennata

Key Differences

• Greater Rhea is Near Threatened while Lesser Rhea is Least Concern.

Taxonomic Classification

Rank	Greater Rhea	Lesser Rhea
Kingdom same	Animalia (สัตว์)	Animalia (สัตว์)
Phylum same	Chordata (สัตว์มีแกนสันหลัง)	Chordata (สัตว์มีแกนสันหลัง)
Class same	Aves (นก)	Aves (นก)
Order same	Rheiformes (Rheiformes)	Rheiformes (Rheiformes)
Family same	Rheidae	Rheidae
Genus same	Rhea	Rhea
Species	Rhea americana	Rhea pennata

Evolutionary Relationship

Greater Rhea and Lesser Rhea share a common ancestor at the Genus level: Rhea.

Conservation Status

Greater Rhea

NT — Near Threatened

Lesser Rhea

LC — Least Concern

Physical Characteristics

Attribute	Greater Rhea	Lesser Rhea
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Greater Rhea

Habitat

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

Range

Found across Europe (7 countries) and South America (Colombia, Ecuador). Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

Lesser Rhea

Habitat

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

Range

Distributed across Norway, Ukraine, and United Kingdom.

Greater Rhea

Greater Rhea (Rhea americana) is classified as Near Threatened (NT) on the IUCN Red List. Close to qualifying as threatened, with populations that may become vulnerable without conservation action.

Shared Countries

Both species can be found in 3 countries:

🇳🇴 Norway 🇺🇦 Ukraine 🇬🇧 United Kingdom