A praying mantis’ thin, spindly limbs and bulging eyes look about as far removed from a person as you can think. The insects are mammals, just like you and me, given their alien nature. Insects share with all the animals on earth the kingdom Animalia. But there is a well-founded belief that humans are so very different from us. Long ago, the insects began diverging from primates and other animals. Scientists estimate that over 500 million years ago there existed the last common ancestor of humans and insects