You will need 32 Grey colored pieces, 160 black pieces for a base of 16 and 1 yellow piece.In the first step (Step 2), connect 16 black triangles (you may also connect 6 grey and 10 black triangles)as you go up, decrease the number of grey triangles (refer the image of angry bird)Step 4,5 shows how to insert a piece.
Step6,7,8 - I have first connected all the grey pieces in descending order
Step 10 - Fill up the rest of the area with black pieces.
Step 11 - Add 3 more rows of complete black piece, then at the center add a grey piece.
Step 12 - Add two more grey pieces as shown and fill the rest with black pieces.
And tadada … the Angry bird is ready :)
My FB page - The art of folding a paper