Humpback smooth hound vs Pygmy three-toed sloth

Mustelus whitneyi compared with Bradypus pygmaeus

Taxonomic Classification

Rank	Humpback smooth hound	Pygmy three-toed sloth
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Chondrichthyes (Cartilaginous Fish)	Mammalia (Mammals)
Order	Carcharhiniformes (Ground Sharks)	Pilosa (Sloths & Anteaters)
Family	Triakidae	Bradypodidae (Three-toed Sloths)
Genus	Mustelus	Bradypus (Three-toed Sloths)
Species	Mustelus whitneyi	Bradypus pygmaeus

Evolutionary Relationship

Humpback smooth hound and Pygmy three-toed sloth share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Humpback smooth hound

CR — Critically Endangered

Pygmy three-toed sloth

CR — Critically Endangered

Physical Characteristics

Attribute	Humpback smooth hound	Pygmy three-toed sloth
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Humpback smooth hound

Habitat

Found across multiple habitat types including temperate broadleaf and mixed forests, temperate grasslands and steppes, and montane grasslands and shrublands, among 5 distinct biome types within the Neotropic biogeographic realm.

Range

Found in Chile. Currently classified as Critically Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Pygmy three-toed sloth

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.