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Fig. 1. Measurement of the craniocaudal center of mass. The dead animal was placed
on its side, with the limbs arranged in a manner that resembled a standing
position. The tail was positioned at about a 45° angle in the sagittal
plane relative to the long axis of the body; this is approximately the same
tail posture that is adopted during normal movement. l, length of
platform between knife points; Ycom, distance between
knife point and center of mass; Ws, weight of opossum;
Wp, weight of knife point platform. See text for
formula.