Log semicircular canal radius (<i>R</i>) 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].

<p>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 <i>Rhinolophus spp</i>., <i>Rhinopoma hardwickii</i>, <i>Cardioderma cor</i> and <i>Pteronotus parnellii</i>. Across all three canals, species with consistently larger canals included <i>C. cor</i> and <i>Rhinolophus megaphyllus</i> and those with consistently smaller were <i>Cloeotis percivali, Rhinolophus philippinensis</i> (small morph) and <i>Macroderma gigas.</i> 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.