The morphological characteristics of the mandible of adult Chaetophractus vellerosus (Gray. 1865) and Zaedyus pichiy (Desmarest. 1804) were studied to establish its generalized design and to identify inter- and intra- (sexual) specific differences. Morphological descriptions were complemented with the application of univariate and multivariate (analysis of correlation matrices. https://foldlyers.shop/product-category/battery-care/