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Figure 1 | Frontiers in Zoology

Figure 1

From: Evolutionary origins of ultrasonic hearing and laryngeal echolocation in bats inferred from morphological analyses of the inner ear

Figure 1

Log basilar membrane length (mm) versus log body mass0.33(g) plotted across mammals. Circles are sized according to the number of turns in the cochlea, and are colour coded as follows: monotremes (black); marsupials (white); non-whale and non-bat placental mammals (brown); echolocating whales (light grey); non-echolocating whales (dark grey); Yangochiroptera (green); echolocating Yinpterochiroptera (blue); Old World fruit bats (orange). The regression line (ordinary least squares) for placental mammals excluding all bats and whales (log basilar membrane = 0.498 log body mass0.33 + 0.717, n = 25, R2 = 0.907, F = 225.343, P = 2.25 x 10 -13) is shown by the solid line and the 95% prediction intervals for this placental mammal sub-sample is represented by the dashed line. This is similar to the regression results for all non-echolocating mammals (with baleen whales and Old World fruit bats omitted): log basilar membrane = 0.503 log body mass0.33 + 0.664, (n = 29, R2 = 0.702, F = 63.877, P = 1.37 x 10 -8).

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