From Will’s Skull Page, here. Here’s a skull of a wild boar. Note the loooong face, practically a straight line from the tip of the snout to the top of the back of the head. We shall now proceed through a series of pig skulls with increasingly steep foreheads. From the UCL Museums and Collections blog, here. Some domestic pigs have a longish snout and nearly straight forehead, like their wild forebears.