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Giardia lamblia is a parasitic flagellate protozoan which causes 'beaver fever'.

Protozoa are microorganisms. They are single-celled heterotrophic eukaryotes, which eat bacteria and other food sources.

It is an old term, and the wider term protist is generally preferred today. However, 'protozoa' is often used for convenience, especially in junior education. It is a convenient hold-all term, and most systems of taxonomy classify 'protozoa' into several different phyla.