|Apple tree - feed the hungry birds|
Apple tree was developed as a part of the inaugural TIG Source Procedural Content Generation Competition. It is described as more of a toy than a game by the author.
Use of Procedural Content Generation Methods
From the thread:
As the birds eat them, the effect on the bird depends on the type of the fruit - now there are just two: one that makes the head of the bird grow, and another which fertilizes the bird so that it heads down to the ground to give bir[th] to a little baby bird
Apple tree - feed the hungry birds thread on the Independent Gaming Source forums.