Broken mesh,help!

Hi guys,
i'm facing a problem with a character imported from 3ds Max.
In 3ds Max the animation work perfectly, but when i import in Unity the animation seems to broke the mesh...
I really dont know what's is happening.
I tried with humanoid and generic rig, but is the same.

If someone could point me in the right direction to solve the problem i would be very grateful..
Here the Unity package with my character if someone want to test it :

https://dl.dropboxusercontent.com/u/12576858/Gorilla.unitypackage


Thanks and good christmas!