Just coz I thought people might be curious:
Here's the timelines for Scoots's body and face, as well as the various animated symbols that comprise her.
I haven't included "library" symbols (like the mouth symbol that just paces through the visimes, or the various eyelashes), nor the symbols that don't change (like the static version of the tail, or her ears).
It's not tweening, it's not frame-by-frame, it's tweening tweaked to the point that it's almost frame-by-frame. While that looks like a LOT of keyframes, there's a lot of copypasta that went into it (Scoots was repetitive), as well as the fact that each column of keys is a single pose- I'd go through, select the entire column and key it, then pose everything. Also, there are tweens indicated even where things are not moving, because I built a lot of this animation after adding tweens to the basic key poses- and there was no need to pull tweens out just to make the timeline look prettier.
So it actually looks a bit more complicated than it is.
Anyways, happy studying!