I have often thought that humans are a pig-ape hybrid. Humans' internal organs are configured exactly like pigs'. Their skin texture is remarkably similar. And their behavior -- well, to call it piggish would be an insult to pigs.

Human skin has a fatty layer while pigs have fat through out. The only animals with fatty layers like ours are sea bound mammals seals, dolphins and such. More then likely our ancestors were beach combing apes. The need to carry things away from the beach led to our up right posture, swimming led to our naked coat and blubber fatty layer. Also with our new upright position we were able to keep the brain cooler and thus allow it to become bigger, a diet rich in omega 3 fatty acids and traces of mercury further fueled our development. Being beach residence no fossils are likely to be found of our original ancestor.