Boxplots showing the position of O. murivorus (orange circles) relative to other strigids including O. sunia (green–blue triangles), according to a series of ratios (a) and angles (b) (from data in Supplementary Table 4), expressed as LOG values. The boxes contain the median, the lower and upper hinges correspond to the first and third quartiles. In yellow, cranial ratios; in light red, brain ratios; in blue, inner ear ratios and angles. BL, body length; BM, body mass; BrS, brain surface; BrV, brain volume; CrbS, cerebellum surface; CHL, cerebral hemisphere length; CHS, cerebral hemisphere surface; CrH, cranium height; CrW, cranium width; OBL, olfactory bulb length; OLS, optic lobe surface; SkLTh, skull lateral thickness (at cerebral hemisphere level); SkLTh-W, skull lateral thickness at wulst level; WS, wulst surface. Semi-circular canals abbreviations as in (Fig. 6, Supplementary Fig. 9).