The time allometry of mammalian chewing movements: chewing frequency scales with body mass in mammals.

For a sample of 26 extant mammalian species, a significant relationship between body mass and chewing frequency was found, in which chewing frequency is proportional to body mass to the -0.128 power. This relationship is similar to previously published data relating stride frequency and body mass in quadrupedal mammals. It was also found that jaw length is proportional to body mass to the 0.312 power, which is consistent with geometric scaling of jaw length. The period of the chewing cycle was found to be proportional to jaw length to the 0.383 power. These results demonstrate that chewing frequency does not scale as metabolic rate, and support the suggestion that the natural frequency of the chewing rhythm may be derived from masses and lengths of the components of the masticatory apparatus alone.