Use the SLINGSHOT on the nest; take the ACORNS 3-4/4 (T).
Select the symbol twice; give the 4 ACORNS to the porcupine. Use the LOCKET on the symbol (U).
Take the RAKE PARTS 1/2 (V).
Select the tree twice; get a TREE PICTURE (W).
Examine the crystals to trigger a puzzle (X).
Select the gems to duplicate the TREE PICTURE (Y).
See screenshot for solution (Z).