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.

Cryptosporidium
Eimeria spp. (coccidian)

Dictyocaulus vivparus (lungworm)
Muellerius capillaris (goat lung worm)

Fasciola hepatica (liver fluke)

Haemonchus contortus (barber pole worm)
Ostertagia circumcincta (brown stomach worm)
Trichostrongylus spp. (hair worm)
Nematodirus spp (thin-necked intestinal worm)
Oesophagostomum columbianum (nodular worm)
Strongyloides papillosus (common thread worm)

Parelaphostrongylus tenuis (brain or meningeal worm)
Trichuris ovis (whipworm)
Moniezia expansa (tapeworm)

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