there's a lot they can eat though too, the first half of that post is all good things for your rats, and that's not even including everything
were you still thinking about getting rat(s)?
~edit: also, interesting thing, Pippin (my younger one) occasionally shakes/shivers pretty intensely at being pet some days. I had tried to figure out what was going on when I first noticed it but couldn't really find much, but the shaking stopped another day so I figured it was fine.
I found an explanation finally though, because Pip was shaking like crazy today and it had me worried again.
https://www.youtube.com/watch?v=hrSipkFnU8o
(the rat in this video actually looks kind of like Pip as well, but Pip has more white on her back, I'll have to share a picture of the two of them sometime for you)