1. 1.

    The agamid lizard Stellio stellio L. accelerates quickly and reaches maximum speed over short distances.

  2. 2.

    Maximum speed on the level is proportional to body mass to the ⅓ power. This relation differs from predictions based on an interspecific scaling model of “geometric” similarity (M0) and is intermediate between predictions based on interspecific scaling models of “elastic” similarity (M¼) and of “static stress” similarity (M⅖).

  3. 3.

    Maximum speed was also measured on slopes ranging from −15° to + 60°. The effect of slope on speed varies with body mass. The maximum speed of large lizards decreases on steep slopes, but that of small lizards is remarkably independent of slope.

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