Are metal singers just big babies? According to Krzysztof Izdebdski, PhD, of the non-profit group Pacific Voice & Speech Foundation, they are! Though it's a little more complicated than that.
According to Izdebdski, metal singers and babies utilize very similar vocal techniques to project harsh, high-volume vocals without ever damaging their vocal chords. This discovery was found through the use of placing high-speed cameras down metal vocalists' throats, and is now a very good way to call your vocalist a big baby without getting punched (maybe).