6-13 2 Birds
Aim first yellow bird at horizontal floor plank of upper treehouse. Hope the stone rolls down and pops pig in the back (happens every once in a while) and debris topple (or at least tilts) first treehouse (happens very rarely).
Loop second yellow bird to pop remaining pig in center treehouse.
(This level often requires 3 or 4 birds. Keep hitting upper treehouse until one or both of the above conditions occur. If nearby treehouse is not at least tilted forward, it is difficult to pop both of its pigs with a single shot to its side wall. Also, pig in back will rarely be popped by random debris unless gotten with the stone on the first shot)
Some High Score Targets:
3 Stars: 80,000
*Top 150: 86,790
*Top 100: 87,830
*Top 10: 92,890
*Top scores in Massachusetts in March, 2011 according to Crystal (a former feature of the Mobile App).