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Protozoa usually range from 10μm-50μm but can grow up to 1mm. Thus, they are usually observed and classified using a microscope.

Protozoa usually range from 10μm-50μm but can grow up to 1mm. Thus, they are usually observed and classified using a microscope.

Not all protozoa are harmful. For example, the [[The Rumen - Anatomy & Physiology|rumen]] of ruminants and the [[Caecum - Anatomy & Physiology|caecum]] and [[Colon - Anatomy & Physiology|colon]] of horses are full of symbiotic protozoa.

Not all protozoa are harmful. For example, the [[Rumen - Anatomy & Physiology|rumen]] of ruminants and the [[Caecum - Anatomy & Physiology|caecum]] and [[Colon - Anatomy & Physiology|colon]] of horses are full of symbiotic protozoa.

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*http://cal.vet.upenn.edu/projects/dxendopar/index.html#host

*http://cal.vet.upenn.edu/projects/dxendopar/index.html#host

''Useful online resource for diagnosing parasitic infections, courtesy of the Laboratory of Parasitology, University of Pennsylvania School of Veterinary Medicine''

''Useful online resource for diagnosing parasitic infections, courtesy of the Laboratory of Parasitology, University of Pennsylvania School of Veterinary Medicine''