a Outline ellipses and regression of body size (on x-axis, as
10-log in grams) against semicircular canal radius (on y-axis, as 10-
log in mm) for modern land mammals (maroon) and modern cetaceans
(blue). Fossil cetaceans are the pakicetid Ichthyolestes (red), the
remingtonocetid Remingtonocetus (orange), the protocetid Indocetus
(yellow), and the basilosaurid Dorudon (purple). Modified from Spoor
et al. (2002). b A reconstruction of inner ear of modern bowhead
whale, showing semicircular canals above, broken stapes (yellow), and
the cochlea below