This Robot Skeleton is Helping Scientists Learn How Prehistoric Animals Moved

A robot mimicking a prehistoric fossil suggests the ancestors of reptiles, birds and mammals might have walked more efficiently on land than previously thought.Nowadays, the most widespread tetrapods, or four-limbed animals, are the amniotes -- creatures that lay eggs on land or give birth to live young, rather than laying eggs in water as amphibians typically do. Previous research suggested the freedom that amniotes had to move on land helped support the evolution of a more energy-effic