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Solid shape and smaller size of the sperm whale stapes. (a) No void was detected within the crura of the stapes as opposed to the human and murine stapes (the shape of the human stapes is interrupted owing to the 2D imaging). (b) Lower stapes length to body length ratio in sperm whales. (c) Stapes length to skull width ratio was equally lower in sperm whales pointing to negative allometry across the species. **p < 0.001.
