The main riff is a bottom-string thing that goes like this:

E | -----------------------------------------------------------------------------
B | -----------------------------------------------------------------------------
G | -----------------------------------------------------------------------------
D | -2--2------------------------2--2--------------------------------------------
A | -0--0------------------------0--0--------------------------------------------
E | -------3--0---3--3--0--3--0--------3--0--3--3--0--3--0-----------------------

Or something like that.  I don't know how to convey the rhythm , but if you
know the song you'll get it.

(riff)                                              C5  B5
I am a hungry wolf and run endlessly with my mate

B5                            C5   B5    C5   B5
I see the gutter fed in the foolish, outrun and kill the strong

    D5                                   E5
At daybreak I run, awake to who follows me

               (riff)
I roam , I roam

(riff)                                                   C5  B5
I am a hungry wolf, and run endlessly with my mate

           C5    B5             C5   B5  
Welcome to dripping jaws, the altar of your death

   D5                                    E5
At daybreak I run, ready to tear up the world

               (riff)
I roam , I roam


(bridge)
     E5               C5
The hungry wolf, she stares from the hill

    E5                     C5   B5   C5   B5 
At villagers around the fire

G5                      B5
She loves her mate, as he loves her

          E5                     (riff)
And they live together for life

(riff)                                                C5  B5
I am a hungry wolf, and I run endlesly with my mate

                C5   B5
Look across the street, my friend

      C5    B5
We're waiting for you to slow down

    D5                                      E5
At daybreak I roam , eyes in the back of my head

                (riff)
I roam , I roam