crocodiles

Terrestrial animals display a wide range of limb structures - from 'spread', in which the limbs are held alongside the body, as in lizards, to 'upright', in which the limbs are held below the body and close to the midline of the animal, as in dogs, cats and horses . An upright 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
Three-dimensional reconstruction of the skull of Carnufex carolinensis. Courtesy of the University of North Carolina

The crocodiles' ancestors were super carnivores even before the dinosaurs moved north

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An illustration comparing a modern man (on the right) with an ancient man (next to him, reminiscent of a monkey), next to an ancient crocodile - the larger of the two and a Yaor crocodile. Illustration: Chris Brochu, University of Iowa.

The largest crocodile that ever lived could swallow a man

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