Waugh, E. et al. 2007. Gross Adaptive Morphologic Changes Occurring in the Gastrointestinal Tract Components of Ostriches Fed Ration Including or Excluding Grit in Botswana. International Journal of Poultry Science. 6, 4 (Mar. 2007), 271–275. DOI:https://doi.org/10.3923/ijps.2007.271.275.