The Impenetrable region (Northern region of the Chaco and Santiago del Estero Provinces and Eastern part of Salta Province, Argentina) is one of the biggest remnant patches of native dry forest (Bertonatti and Corcuera 2000). Most of the Impenetrable woodlands are found in the Chaco Province, and are legally protected by two fairly new Provincial Parks (P. P): The “Fuerte Esperanza” P. P. (283 km2), created in 2001 (SGPC 2001), and the “Loro Hablador” P. P. (175 km2), created in 2004 (SGPC 2004).Museo de La Plat
