Why would the shape help you float? Shape has no effect on buoyancy, only density.
@freemo Well they do have most of the buoyancy between the front and rear propulsion units, so that might help them move through the water more efficiently. They share the water with large constrictor snakes.
@mike805 Yea I can totally see their shape helping them be better swimmers by being more aerodynamic. Thats not the same as "floating" though.
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