Clown Frog vs Linnaeus's mouse opossum

Atelopus varius compared with Marmosa murina

Key Differences

• Clown Frog is Critically Endangered while Linnaeus's mouse opossum is Least Concern.

Taxonomic Classification

Rank	Clown Frog	Linnaeus's mouse opossum
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Amphibia (Amphibians)	Mammalia (Mammals)
Order	Anura (Frogs & Toads)	Didelphimorphia (Didelphimorphia)
Family	Bufonidae	Didelphidae
Genus	Atelopus	Marmosa
Species	Atelopus varius	Marmosa murina

Evolutionary Relationship

Clown Frog and Linnaeus's mouse opossum share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Clown Frog

CR — Critically Endangered

Linnaeus's mouse opossum

LC — Least Concern

Physical Characteristics

Attribute	Clown Frog	Linnaeus's mouse opossum
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Clown Frog

Habitat

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

Linnaeus's mouse opossum

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Distributed across Colombia and Venezuela.

Clown Frog

The clown frog (Atelopus varius), also known as the harlequin frog or variable harlequin toad, is a small, vibrantly colored true toad in the family Bufonidae native to the premontane and montane rainforests of Costa Rica and Panama. Adults display bold black-and-yellow or black-and-orange aposematic patterns that warn predators of their skin toxins. Males typically measure 27–39 mm in snout-vent length and females slightly larger. The species inhabits fast-flowing streams in humid highland forests at elevations generally between 200 and 1,800 m, where breeding occurs in riparian zones. Atelopus varius was once common throughout its range but has suffered catastrophic population declines since the 1980s, primarily due to the chytrid fungal pathogen Batrachochytrium dendrobatidis (Bd), which has driven mass mortality events in amphibians globally. Additional threats include habitat loss from deforestation and agricultural expansion. The species is listed as Critically Endangered by the IUCN. Conservation programs involving captive breeding and disease-resistant population management are underway in Costa Rica and Panama in collaboration with international zoos.