Montana Wild Life. Official Publication Vol Jan 1929

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J. BUTLER, State Veterinarian of Montana WHICH came first —the duck or the egg? We are still pondering over that question and probably will for all eternity. We might also ask ourselves the question which came first — wild animal life or disease-pro- ducing organisms? We do not know because many organisms can lead a saprophytic life. That is. they can live and propagate themselves outside of the animal body but become disease producers when they gain entrance into the living body. That does not... hold good for all organisms, or parasites, by any means. There are innumerable bacteria and worms, or what we may call greater parasites, that require the animal body or several animal bodies in order to propagate.
Undoubtedly, evolution has played a very important part in the development and selective adaptability of many of our present known bacteria and greater parasites. In this article, for the sake of brevity and clearness, we shall limit the term "parasites" to include only round and flat worms, although a parasite is any plant or animal which lives upon or within a living organism.


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