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Summary A description is given of the external features, the muscles moving the rhinarium and lower lip, the jaw muscles and the muscles attached to the occiput in a yearling male Hylochoerus. Rubbing places and scrapes made by the animals in their natural habitat, possibly in search of small invertebrates, are described and certain features of the skull architecture and musculature are considered in relation to the chewing mechanism.
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R. F. Ewer (1970) studied this question.
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