Optimized method for evaluation of bile acids from dry or ethanol preserved fecal samples as a tool for the identification of wild carnivores Údair: Salame-Méndez, Arturo, Andrade-Herrera, Moisés, Zamora-Torres, Leo, Serrano, Héctor, Soto-Mendoza, Saúl, Castro-Campillo, Alondra, Ramírez Pulido, José, Haro-Castellanos, Jorge