Figure 4.5 Data on worm prevalence were collected from the literature. The counts are of the prevalence of a particular worm species in a particular study. So, for example, one datum is the prevalence of the nematode Ascaris suum in a study of 48 feral swine on an island in Georgia, USA. The top histogram shows data for nematodes and the bottom for cestodes. As expected, the sexual nematodes exhibit bimodal prevalences whereas the cestodes do not. This result is unaffected by the choice of bin size.

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