Irrawaddy dolphin vs Lesser Siren

Orcaella brevirostris compared with Siren intermedia

Key Differences

• Irrawaddy dolphin is Endangered while Lesser Siren is Least Concern.

Taxonomic Classification

Rank	Irrawaddy dolphin	Lesser Siren
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Mammalia (Mammals)	Amphibia (Amphibians)
Order	Cetacea (Whales & Dolphins)	Caudata (Caudata)
Family	Delphinidae (Oceanic Dolphins)	Sirenidae
Genus	Orcaella	Siren
Species	Orcaella brevirostris	Siren intermedia

Evolutionary Relationship

Irrawaddy dolphin and Lesser Siren share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Irrawaddy dolphin

EN — Endangered

Lesser Siren

LC — Least Concern

Physical Characteristics

Attribute	Irrawaddy dolphin	Lesser Siren
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Irrawaddy dolphin

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Lesser Siren

Habitat

Typically found in freshwater habitats, moist forests, and wetlands.

Range

Distributed across Belgium and Mexico.