Amobae of Entamoeba histolytica, the cause of amoebic dysentery in humans;
Trypanosoma brucei, a flagellate protozoan causing sleeping sickness in humans;
Balantidium coli, a usually harmless ciliate parasite of the intestine of pigs;
Symbiotic ciliates from the rumen of cattle: one species is completely covered with cilia; the other is naked except for a crown of cilia at the anterior end of the organisms;
Babesia sp., an apicomplexan parasite in the red blood cells of an African lion.