WILD symbols can shake and fall from the tree to grant winning opportunities on each spin.
If you get three ying yang symbols, you win 10 free spins in which wild symbols drop on every spin. You can re-trigger during the free spins.
If you get three Cat symbols, you pick one of them to reveal how many credits you won. Even during the regular spins, sometimes the money tree above the reels shakes and it drops wild symbols.