Inhabiting the plains of both hemispheres on Darwin IV, these swift bipeds can run faster than 40 mph, aided by a remarkably flexible back that allows it to stretch out for 45-foot-long strides. The structure of its two heavily-muscled legs suggests descent from a quadrupedal ancestor. Since two legs present a greater challenge to maintaining balance while moving at high speeds, the gyrosprinter possesses a pair of small post-like organs above and behind its neck that function like bubble levels. Two huge nostrils on its back ensure a steady supply of Darwin IV's air to fuel its high energy levels. Tiny biolights glow on its hairless body.

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