Animal Parasites
Last are the animal parasites, these include some single celled animals (protozoa) and certain parasitic worms, which of course are many celled animals. An animal parasite is an organism that has developed the capacity to live in or in the body of another animal, known as the host. Animal parasites obtain food from the host, thus they live at the host’s expense, weakening it and causing disease. Most animal parasites have acquired a remarkable ability. They spend part of their lives in one host (a human being) and the rest of their lives in another host (which can range from a mosquito to a cow: fish are particularly common hosts). Some major tropical diseases, including amoebic dysentery and malaria, are caused by protozoan parasites. There are some worms that make their homes in humans, including pinworms, tape worms, and flukes.
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