BRYANT, J.; ROTH, T. Annual fecal glucocorticoid metabolite concentrations in pregnant and pseudopregnant polar bears (Ursus maritimus) in North American zoos. Journal of Zoo and Aquarium Research, [S. l.], v. 6, n. 1, p. 6–11, 2018. DOI: 10.19227/jzar.v6i1.259. Disponível em: https://jzar.org/jzar/article/view/259. Acesso em: 26 oct. 2021.