What are three types of animal parasites?

Three common types of animal parasites are protozoa, helminths, and ectoparasites. Protozoa, such as Giardia, are single-celled organisms that can infect the intestines. Helminths include worms like tapeworms and roundworms, which can reside in the digestive tract or other organs. Ectoparasites, like fleas and ticks, live on the surface of their hosts and can cause various health issues.