Figure 3. Log semicircular canal radius (R) versus log body mass^0.33– for (A) anterior, (B) lateral and (C) posterior semicircular canals across bats [Old World fruit bats (orange); echolocating Yinpterochiroptera (blue); Yangochiroptera (yellow)] and non-flying mammals [species designated as small body-sized (black) and species designated as large body-sized (grey) according to the data].

95% prediction intervals (dashed lines) and 95% confidence intervals (solid lines) are shown for the mammal regression lines. Lateral semicircular canal size of echolocating bats showed the most variation of all three canals; species falling above the 95% PI (and thus larger lateral canals than expected) were six Rhinolophus spp., Rhinopoma hardwickii, Cardioderma cor and Pteronotus parnellii. Across all three canals, species with consistently larger canals included C. cor and Rhinolophus megaphyllus and those with consistently smaller were Cloeotis percivali, Rhinolophus philippinensis (small morph) and Macroderma gigas. However, it should be noted that OLS regression prediction and confidence intervals calculated assume independent data points and, therefore, the intervals presented here may underestimate the actual values.