1. Cranial Biomechanics as Predictors of Feeding Strategy in Ungulates
Start Date
April 2026
Location
3rd floor - Library
Abstract
Ungulates display a wide range of adaptations in their skulls, jaws, and teeth that reflect their feeding strategies and ecological niches. Diet broadly classifies species as grazers, browsers, or intermediate feeders, each with distinct cranial and dental morphologies shaped by the mechanical demands of their diet. In this study, quantitative cranial measurements were taken from 19 ungulate specimens across seven species and standardized by skull length and jaw length to produce size-independent ratios. Mechanical advantage indices were calculated for the masseter and temporalis muscles to assess differences in jaw biomechanics across feeding groups. A one-way ANOVA revealed significant differences between feeding groups for the relative masseter arm (RMAM; F (2,16) = 19.39, p < 0.001) and masseter mechanical advantage (MAMDLM1; F (2,16) = 10.87, p = 0.001). Grazers showed the highest masseter leverage, consistent with the prolonged grinding demands of abrasive, high-silica grasses. Browsers displayed lower masseter mechanical advantage, reflecting muscle arrangements optimized for precise shearing of leaves and twigs. Intermediate feeders exhibited a combination of these traits, reflecting their mixed diets. These findings support the broader relationship between cranial morphology and dietary specialization, suggesting that masseter leverage is a strong predictor of feeding strategy in ungulates.
1. Cranial Biomechanics as Predictors of Feeding Strategy in Ungulates
3rd floor - Library
Ungulates display a wide range of adaptations in their skulls, jaws, and teeth that reflect their feeding strategies and ecological niches. Diet broadly classifies species as grazers, browsers, or intermediate feeders, each with distinct cranial and dental morphologies shaped by the mechanical demands of their diet. In this study, quantitative cranial measurements were taken from 19 ungulate specimens across seven species and standardized by skull length and jaw length to produce size-independent ratios. Mechanical advantage indices were calculated for the masseter and temporalis muscles to assess differences in jaw biomechanics across feeding groups. A one-way ANOVA revealed significant differences between feeding groups for the relative masseter arm (RMAM; F (2,16) = 19.39, p < 0.001) and masseter mechanical advantage (MAMDLM1; F (2,16) = 10.87, p = 0.001). Grazers showed the highest masseter leverage, consistent with the prolonged grinding demands of abrasive, high-silica grasses. Browsers displayed lower masseter mechanical advantage, reflecting muscle arrangements optimized for precise shearing of leaves and twigs. Intermediate feeders exhibited a combination of these traits, reflecting their mixed diets. These findings support the broader relationship between cranial morphology and dietary specialization, suggesting that masseter leverage is a strong predictor of feeding strategy in ungulates.
