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Range DescriptionRallus semiplumbeus occurs on the Ubat-Bogot plateau in Cundinamarca and Boyac in the east Andes of Colombia. The race peruvianus of Peru is only known from its type material, collected in 1886, and is probably extinct (del Hoyo et al. 1996). In Boyac, it is known from Laguna de Tota and, in Cundinamarca, it has been recorded at a minimum of 21 localities. The Ubat-Bogot plateau formerly held enormous marshes and swamps, but few lakes with suitable habitat remain (Fjelds and Krabbe 1990). Although declining, it is still uncommon to fairly common, with notable populations including c.400 birds at Laguna de Tota, c.50 territories at Laguna de la Herrera, c.110 birds at Parque la Florida (Lozano 1993), and those at La Conejera Marsh and Laguna de Fquene (F. G. Stiles in litt. 1999).