Oak tree with 3 LOD levels. Blender 2.60 source file.
LOD0: 4407 vertices, 2791 faces
LOD1: 645 vertices, 442 faces
LOD2: 21 vertices, 7 faces
Collision (only trunk): 24 vertices, 16 faces
LOD1 and LOD2 use separate texture (prerendered branches and foliage).
The model is from Khayyam/Shinya game project.