This is no Simba. Unlike the song, this lion is not sleeping tonight. Instinct kicks in, and you begin to run,  but even the fastest human on Earth, Usain Bolt,  with his record-breaking speed of almost 45 km/h (28 mph), can't outrun this terrifying beast. In fact, with an average speed of 80 km/h (50 mph) a lion can run almost twice as fast as you can. And if it's gunning for you, a lion can can clock up to 128 km/h (80 mph).