Hi there,
In this Blendfile you will find 3 animated trees ready to be used in your game
i used 2 Textures by Lauris Kaplinski
on Devian art http://lauris71.deviantart.com/gallery/
Append the different groups to your project and you should be ready to go!
i used Sapling for the creation of the trees and the animation
thnx to Trueman
Not all the textures are packed. The textures "25_birke_rinde.jpg" and "35_treebark.jpg" didn't come in the download.