In the embryo stage they are migratory, moving from host to host, or to a free life before becoming mature…Īmong the latter are the so-called fish-lice, which, with piercing mouth organs and elaborate clinging apparatus, remain in the same host always, and are among the most degenerate parasites known.
Among the former are the bed-bug and the leech, which usually abandon their host when they have obtained their object. Occasional parasites are to be distinguished from permanent parasites. Animal Parasites are invertebrate animals which have taken up their abode in or upon the living bodies of other animals.įrom a broad biological outlook parasitism is a negative reaction to the struggle for existence, and always implies a mode of life that is nearer the line of least resistance…
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