*Larvae (L4) - feed on colon mucosa, nip off epithelium, not true plug-feeders (erosions).
*Larvae (L4) - feed on colon mucosa, nip off epithelium, not true plug-feeders (erosions).
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*Adults - non-pathogenic, feed on gut contents; but egg-laying activity of female worms irritant (''pruritis ani''), broken hair and bare patches over rump and tail head (seat itch).
+
*Adults - non-pathogenic, feed on gut contents; but egg-laying activity of female worms irritant (''pruritus ani''), broken hair and bare patches over rump and tail head (seat itch).