for this song you only need these four chords:
-F 
-C 
-E 
-Am

The strumming pattrern changes throughout so just have a listen to the song and 
see what works for you :)

(accapella)
Well I didn't tell anyone but a bird flew by
saw what i'd done he set up a nest outside
and he sang about what i'd become

   F             C
He sang so loud, sang so clear
E                    Am
I was afraid all the neighbours would hear
     F                      C
so i invited him in just to reason with him
  E                   Am
i promised I wouldn't do it again

            F
But he sang louder and louder inside the house
    C
and now i couldn't get him out
     E
so I trapped him under a cardboard box
    Am
and stood on him to make it stop
  F
I picked up the bird and above the din i said
C(stop short)
that's the last song you'll ever sing
F
held him down broke his neck
C
taught him a lesson he wouldnt forget

  E Am
    
    F              C
But in my dreams began to creep
     E            Am
that old familiar tweet, tweet, tweet

  E      
I opened my mouth to scream and shout
  Am
I waved my arms and I flapped about 
      E
but I couldn't scream and I couldn't shout
Am
couldn't scream and couldn't shout
  F
I opened my mouth to scream and shout
  Am
I waved my arms and I flapped about 
      E
but I couldn't scream and I couldn't shout
    Am                      F       C
the song was coming from my mouth
        E   Am
from my mouth
        F   C
*from my mouth
        E   Am
from my mouth*

*Repeat 4 more times with same chords-you can put variations if you wish, like 
plucking instead of straight chords

(Am--->)F   C
from my mouth
        E   Am
from my mouth
        F   C
from my mouth
        E        F      C      E      Am      F     C     E      Am
from my mouth (held on)-------------------------------------------->

F to finish

hope you like it :)