Pigs share a number of surprising comparable traits with humans. For instance, we both have hairless skin, a thick layer of subcutaneous fat, light-colored eyes, protruding noses and heavy eyelashes. Pig skin tissues and heart valves are remarkably similar too. Pigs are the fourth most intelligent species on the planet, they have even been known to be able to use a special joystick, to manipulate a cursor around a computer screen to contact specific targets in tests. They outperform 3 year old c