Zoelzer, Franziska, Caroline Engel, Dierkes Paul W., and Burger Anna Lena. 2020. “A Comparative Study of Nightly Allonursing Behaviour in Four Zoo-Housed Groups of Giraffes (Giraffa Camelopardalis) ”. Journal of Zoo and Aquarium Research 8 (3):175-80. https://doi.org/10.19227/jzar.v8i3.508.