Octopus goes twice as fast, with a wheel

How fast does an octopus typically run in an exercise wheel? That has yet to be determined. But one value is reported in the study:

"Cutaneous Respiration in Octopus Vulgaris," J.J. Madan and M.J. Wells, Journal of Experimental Biology, vol. 199, pp. 2477–2483 (1996). The authors, at the University of Cambridge, UK, explain, citing two previous studies, one of which they were involved with directly:

"An octopus running in an exercise wheel consumes about two and a half times as much oxygen as a resting animal."