The Olinguito: A Case of Mistaken Identity Hiding in Plain Sight for Decades

Nature · Published 3 October 2026 Swipe more like this →

In short: For years, the olinguito lived in zoos and museums, misidentified as its cousin, the kinkajou. It took until 2013 for science to formally recognize this elusive, tree-dwelling mammal. Its discovery reveals how parallel evolution can mask distinct lineages, hiding a unique species within the shadows of the South American rainforests.

The genus Bassaricyon, commonly known as olingos, comprises small, nocturnal, arboreal mammals native to the rainforests stretching from Nicaragua to Peru. While they share a striking physical resemblance to kinkajous—another member of the procyonid family—the two are not closely related. Olingos possess distinct features such as anal scent glands, longer muzzles, and non-prehensile tails. Their similarity to kinkajous is a classic example of parallel evolution, where unrelated species develop similar traits to adapt to comparable ecological niches.

The taxonomic classification of olingos has long been a subject of debate, with estimates of species counts ranging from one to five. A major breakthrough occurred in 2006 when researcher Kristofer Helgen identified a distinct species, the olinguito (B. neblina), at Las Maquinas in the Ecuadorian Andes. By 2013, Helgen and his team confirmed the existence of four distinct species using a combination of anatomical analysis, morphometrics, and DNA sequencing. This research clarified that the closest relatives of olingos are actually coatis, not kinkajous.

Genetic evidence suggests the divergence between olingos and coatis occurred approximately 10.2 million years ago during the Tortonian age. In contrast, the kinkajou lineage split from other procyonids much earlier, around 22.6 million years ago in the Aquitanian age. The diversification of the olingo genus itself began roughly 3.5 million years ago, likely following the Great American Interchange, when ancestral olingos migrated from Central America into northwestern South America. This evolutionary history highlights how the olinguito, which branched off first, represents a unique chapter in the biogeography of the Andes.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?

Related

• The Kinkajou is a solitary, fruit-eating relative of the raccoon that lives in trees.
• The extinct South American mammals that evolved to look exactly like horses and camels
• The elusive short-eared dog is a solitary, semi-aquatic enigma of the Amazon rainforest
• The forest-dwelling humans who share 97% of our DNA
• The long-necked Macrauchenia was a mysterious South American giant that baffled Charles Darwin.
• The Bateleur is an African eagle that spends its life performing aerial acrobatics.
• The Cretaceous predator that redefined our understanding of dinosaur diets and aquatic habits
• The deep-sea tripod fish stands on stilts to hunt in the pitch black
• The deep-sea fish with a transparent head and eyes that rotate like turrets
• The toadfish is a singing, venomous, nest-guarding master of the ocean floor
• Why the world's most common swallow abandoned its ancestral caves for your barn
• These ancient, land-dwelling crocodilians traded the water for a life as apex predators

More in Vertebrates · More in Nature · Latest · A–Z · All topics