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Use "epizoa" in a sentence
"The epizoa generally lodge themselves in various parts of the plumage of birds; and almost every group of birds becomes the host of some specific or varietal form with distinct adaptations."
"Almost every animal is a living poor-house, and harbors one or more species of _epizoa_ or _entozoa_, supplying them gratis, not only with a permanent home, but with all the necessaries and luxuries of life."
""fittest" -- which many take to mean "best" or "highest" -- whereas natural selection may work towards degradation: vide epizoa."