“Faecal Glucocorticoid Concentrations During ACTH Challenge Tests in Captive Grizzly Bears (Ursus Arctos Horribilis) and Polar Bears (Ursus Maritimus)”. 2015. Journal of Zoo and Aquarium Research 3 (2): 59-62. https://doi.org/10.19227/jzar.v3i2.116.