500 years ago Leonardo built a mechanical lion that could even walk!

One of the most intriguing sketches found in Leonardo Da Vinci's notebooks was of a 'robot lion.' He left nothing more than a rudimentary sketch that had puzzled art historians for hundreds of years.

It wasn't until recently, when a 66-year-old designer of automatons called Renato Boaretto decided to build it. He used the sketches, and contemporary accounts of the lion to figure out how Leonardo had built it.

Historians consider that Leonardo's invention was about 300 years ahead of it's time. If you wind it up, the lion can walk, twirl it's tail, rotate it's head and even display it's fangs all by itself!