Figure 1 (IMAGE)

Harvard University, Department of Organismic and Evolutionary Biology

Figure 1

Caption

Land animals exhibit a continuum of limb postures – ranging from ‘sprawled’, with the limbs held out to the side of the body, like lizards, to ‘upright’ or ‘erect’, with the limbs held beneath the body and close to the animal’s midline, like dogs, cats and horses. Upright posture is characteristic of most modern mammals, but when did this key trait evolve?

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Peter Bishop

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