This common chimpanzee at Busch Gardens in Tampa seemed to be staring with as much curiosity at its closest evolutionary cousins – humans – as they were watching him. Chimps and mankind had common ancestors dating back four to six million years ago. In fact, they still share about 94% of common DNA. In the wilds of western and central Africa, this male would have a life expectancy of about 33 years but it is almost twice that long in captivity.