Neandertals Had Big Mouths, Gaped WidelyMati Milstein in Tel Aviv, Israel for National Geographic NewsMay 2, 2008 Neandertals had big mouths that they were able to open unusually wide, new research has determined. A recent study found that a combination of facial structure, forward-positioned molars, and an unusually large gap between the vertical parts of the back of the jaw allowed Neandertals (also spelled Neanderthals) to gape widely. Modern humans and our direct ancestors don't have these traits, the researchers note. But the team was unable to measure exactly how far Neandertals could open their mouths. "This ability is connected...