puzzle piece 1.5 -

Ive tried and tried and I still cant see the puzzle piece for this. I've looked on the rocks, next to the wood everything! Its driving me crazy! Help!!!

I did this level under 3 players and never saw a piece but on the second time around, I did see a faint 'morph' near the point on the largest rock/cliff on the bottom right. I clicked all over the entire game and found the piece according to the game but have never actually seen it! you can click on 10 birds to zap them for another achievement on this level.