Answer
The answer is as follows. 
Katrielle and the Millionaires' Conspiracy walkthrough
Puzzle Location: Millionaires' Row (The top of the tree in front)
There is a bird in the middle of the forest, and it has a strange habit of flying from yellow trees to green trees to get to where it wants to go.
Help it find a route back to the eggs waiting in its nest, stopping off at every tree along the way.
Slide the bird to move it between trees, without bumping into or flying over other trees.
It's possible to figure out the correct route by starting at the destination.
Find a route that involves a circuit of the trees around the outside edge.
First, head to the right.
Continuing on from hint three...
If you start from the nest and plot a clockwise route around the outside edge, you should be able to see the right way to go.
The answer is as follows.