Fun little project that uses the organic supports from PrusaSlicer 2.6 (alpha right now). Just handle the supports a bit different. Switch top contact Z distance to 0 (soluble) and perhaps switch of the interface layers to weld the supports to the birds. You need to paint supports to the bottom of the birds and you might want to exclude some areas from the birds (eyes) from three generation. You can see all this in the example.3mf file. The large bottom layer is a bit of a pain but it's needed to trick PS to generate only one tree. At least it's the only way I found to solve the riddle. 

The result should be  a tree with birds.

The design works best with two colors (MMU, AMS, Palet, tool changer etc.) but you can print it with a single color too. 

If you're looking for a version that generates several trees you might want to look at this version:  https://www.printables.com/model/449827-birds-without-trees

If you're looking for more decorative prints you might want to check this little collection: https://www.printables.com/@Wilko/collections/36089. If you're looking for more multicolored prints you might want to check this collection https://www.printables.com/@Wilko/collections/177810.