The great apes excluding humans are known to be poor swimmers. They are not very buoyant and water runs into their nostrils easily. Mudokons might have the same problem. Not with nostrils, obviously, but with buoyancy. They have very little fat that might otherwise keep them afloat, despite their alleged avian ancestry they clearly have no air sacks for breathing, and the mammalian thoracic inflation that appears to facilitate their breathing also seems to rule out a pneumatic humerus.
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