5-4 2 Birds
Aim first red bird at top sand notch on upper right lattice structure. Make sure right and bottom structures are destroyed and hope that structure on the left becomes compromised.
Aim second red bird at top sand notch of remaining structure, or floor beneath top monkey, depending on what remains of structure.
(I used a slightly different technique in published YouTube version)
2 Stars: 94,000
3 Stars: 103,000