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1994 |
Stone, bone or blubber? Buoyancy control strategies in aquatic tetrapods. In: L. Maddock, Q. Bone, & J. M. V. Rayner (eds.), Mechanics and physiology of animal swimming.
Cambridge, Cambridge Univ. Press (260 pp.): 151-161. 1 tab. 4 figs.
–Suggests that sirs. are convergent on sea otters and placodonts in that they show increases in body density and submerged lung volume as adaptations for bottom-feeding in shallow water (160).
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