Muhairwa A P, Msoffe P L, Ramadhani S, Mollel E L, Mtambo M M A and Kassuku A A 2007: Prevalence of gastro-intestinal helminths in free-range ducks in Morogoro Municipality, Tanzania. Livestock Research for Rural Development. Volume 19, Article #48. Retrieved , from http://www.lrrd.org/lrrd19/4/muha19048.htm