Stress hormone level and the welfare of captive European bison (Bison bonasus): the effects of visitor pressure and the social structure of herds by Daniel Klich, Rafał Łopucki, Marta Gałązka, Agnieszka Ścibior, Dorota Gołębiowska, Rita Brzezińska, Bartosz Kruszewski, Tadeusz Kaleta, Wanda Olech

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