Ayala-García, B., Fuentes-Farías, A.L. and Gutiérrez-Ospina, G. 2020. Phenotypic variation in American bullfrogs (<em>Lithobates catesbeianus</em>) bred under intensive systems in Mexico: A preliminary report. Veterinaria México OA. 7, 1 (Mar. 2020). DOI:https://doi.org/10.22201/fmvz.24486760e.2020.1.747.