Stephanie Pierce

Terrestrial animals exhibit a wide range of limb structures – from ‘prostrate’, where the limbs are held alongside the body, as in lizards, to ‘erect’, where the limbs are held under the body and close to the animal’s midline, as in dogs, cats and horses. An erect body structure is a characteristic of most modern mammals, but when did this key feature evolve? Credit: Peter Bishop 

How mammals achieved their upright posture 

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A new study reveals the twists and turns and complexities in the evolution of mammals, from a spread body structure (legs tending to the sides like in reptiles) to an upright body structure where the feet are stable on the ground
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