The Las Cajas water mouse (Neusticomys orcesi) is a species of rodent in the family Cricetidae. It is endemic to the Cajas National Park in Ecuador."Parque National Cajas", map and brochure from Etapa, Cuenca, 2009 Its natural habitat is the high grassland (páramo) of the park, where it lives near streams, eating small fish and large invertebrates. It was formerly placed in the genus Chibchanomys, but was moved to Neusticomys in 2023.
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