| demographic survey of black howler monkey (alouatta pigra) in the lachuá eco-region in alta verapaz, guatemala. | guatemala harbors three species of primates (alouatta palliata, alouatta pigra and ateles geoffroyi), but the distribution and state of conservation of populations of these species are poorly documented. in the case of a. pigra, populations have been studied recently and documented in several sites in mexico and belize, and only in one site in guatemala (tikal national park). in this study, we report first-time population data for a. pigra existing in the lachuá eco-region in northwestern guatem ... | 2008 | 17823920 |