<P> "Three Billy Goats Gruff" (Norwegian: De tre bukkene Bruse) is a Norwegian fairy tale . The fairy tale was collected by Peter Christen Asbjørnsen and Jørgen Moe in their Norske Folkeeventyr, first published between 1841 and 1844 . It has an "eat - me - when - I'm - fatter" plot (Aarne - Thompson type 122E). </P> <P> The story introduces three male goats, sometimes identified as a youngster, father and grandfather, but more often described as brothers . In other adaptations, there is a baby or child goat, mama goat and papa goat . In any case, there is almost no grass left for them to eat near where they live, so they must cross a river to get to "sæter" (a meadow) or hillside on the other side of a stream in order to eat and fatten themselves up . To do so, however, they must first cross a bridge, under which lives a fearsome and hideous troll, who is so territorial that he eats anyone who tries to cross the bridge . </P> <P> The smallest billy goat is the first to cross and is stopped abruptly by the troll who threatens to "gobble him up!" However, the little goat convinces the troll to wait for his big brother to come across, because he is larger and would make for a more gratifying feast . The greedy troll agrees and lets the smallest goat cross . </P>

Who lives under the bridge that the three billy goats