Four 4-month-old ostriches exhibiting poor growth were submitted for n
ecropsy. Gross findings included marked emaciation and pancreatic atro
phy. Histological examination revealed pancreatic cryptosporidiosis wi
th large numbers of Cryptosporidium sp. present in the ductal epitheli
um causing necrosis and lymphoplasmacytic inflammation. The gross and
histological findings in these birds and the transmission electron mic
roscopic features of the parasites are described.