Four-toed Hedgehog vs Humpback smooth hound

Atelerix albiventris compared with Mustelus whitneyi

Key Differences

• Four-toed Hedgehog is Least Concern while Humpback smooth hound is Critically Endangered.

Taxonomic Classification

Rank	Four-toed Hedgehog	Humpback smooth hound
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Mammalia (Mammals)	Chondrichthyes (Cartilaginous Fish)
Order	Erinaceomorpha (Erinaceomorpha)	Carcharhiniformes (Ground Sharks)
Family	Erinaceidae	Triakidae
Genus	Atelerix	Mustelus
Species	Atelerix albiventris	Mustelus whitneyi

Evolutionary Relationship

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

Conservation Status

Four-toed Hedgehog

LC — Least Concern

Humpback smooth hound

CR — Critically Endangered

Physical Characteristics

Attribute	Four-toed Hedgehog	Humpback smooth hound
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Four-toed Hedgehog

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Distributed across Ecuador and Spain.

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.