The Incan Water Mouse (Incanomys mayopuma) is a remarkable semi-aquatic rodent living in the high altitude mountain forests of Peru. This tiny but tough little creature is formally described as a new genus and species and is proof of the rich and changing biodiversity of the central Andes. The name refers to the ancient Inca Empire and the predatory river-dwelling nature of the animal, taken from the Quechua words mayu (river) and puma.
It is endemic only to Peru, where it occurs in humid montane forest and in steep, rushing streams of the Peruvian Yungas. It is found mainly around the famous sanctuary of Machu Picchu in the region of Cusco, but also reaches north to Huanuco. It occurs in a very specific habitat, at altitudes of some 2,400 to 3,400 m above sea level. It is a lonely place and the cold flowing waters on which it depends are to be found there.
Key Physical Traits And Ecological Adaptations
Semi-Aquatic Adaptations: Incas Water Mouse. Large hind feet with stiff fringes of hair; a long tail with hair; nostrils capable of being closed, adapted for swimming in the rapid mountain streams.
Carnivorous diet A carnivorous or insectivorous diet is indicated by its specialised dentition, preying on small aquatic invertebrates, compared to most of the Andean rodents which are predominantly seed or vegetation eaters.
Concealed Features Dark slate-grey dorsal pelage with white guard hairs and a lighter belly. The external ears are vestigial, much reduced, and are hidden deep in the fur on the head to streamline movement through the water.
Unique genetics A unique and unmatched chromosome number has been recorded in its tribe, a finding that highlights its significant evolutionary divergence and its biogeographic isolation in the Andes.
Visitor Info, Exploration And Best Time
How to get there: The find site is easy to reach from Cusco, on the road to the Sacred Valley and the ancient citadel of Machu Picchu.
Best Time to Visit The dry season, from May to September, is the best time to hike Andean cloud forests, spot local wildlife, and explore archaeological trails.
Visitor Tips: Watch for local conservation efforts led by park rangers, honour fragile natural habitats around mountain streams and walk lightly through protected sanctuary zones.
Nearby Destinations And Andean Sights
Machu Picchu Sanctuary: A stunning 15th century Inca citadel perched atop the foggy mountain peaks and verdant tropical cloud forests.
Wiñay Wayna. This is an impressive archaeological complex on the mountainside along the Classic Inca Trail, surrounded by terraced agricultural fields and flowing streams.
The Sacred Valley A verdant river valley with traditional Andean villages, colourful artisan markets and impressive ancient fortresses.
