This blog was originally published by BigID here. Written by Sarah Hospelhorn, BigID. Classification’s never been an easy thing: even Aristotle struggled with it. When he tried to divide organisms into two groups (plants and animals) and then each of those into three (the former got shrubs, hedges, trees; the latter land, air, and water), it wasn’t enough. If a bird was sorted as an animal that is of the air – what about our lovely penguin friends and other birds that don’t fly?In the natur…