I don't know this person but the rigging on the bird is great and he has some other MotionBuilder tutorials.
Really nice to see some non-mocap work being done with Mobu.
This DVD Autodesk Master Class gives you the practical tools and ideas to create custom character rigging and animation using Autodesk's MotionBuilder software. Great for existing MotionBuilder users starting out to old pros, as well as riggers and animators whom are new to MotionBuilder.
MotionBuilder Rigging to Retargeting workshop (get the ebook free when taking this ondemand course)