Gerstner, K., Liesegang, A., Hatt, J.-M., Clauss, M., & Galeffi, C. (2016). Seasonal body mass changes and feed intake in spectacled bears (Tremarctos ornatus) at Zurich Zoo. Journal of Zoo and Aquarium Research, 4(3), 121–126. https://doi.org/10.19227/jzar.v4i3.181