Confounding factors in the isotopic analysis of herbivore fecal samples - Trentini, Isabela Pivetta; Magioli, Marcelo; Grotta-Neto, Francisco; Peres, Pedro Henrique de Faria; Ferraz, Katia Maria Paschoaletto Micchi de Barros; Moreira, Marcelo Zacharias; Oliveira, Márcio Leite de; Duarte, José Maurício Barbanti (European Journal of Wildlife Research, 2025)