The intestinal thread worm (Strongyloides papillosus ) has a very interesting life cycle. Adults can live either free living in the soil or produce an infective form which reproduces in the intestine of goats, sheep or cattle. The parasitic form exists as females only reproducing parthenogenically. The larvae can also be transmitted in milk.
Additional animations describing the life cycles of parasites that infect the goat.
Haemonchus contortus (barber pole worm)
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