Chester, one of my rats, likes to get what looks to be big pieces of alfalfa from his food, take it into their little house and just keep it there. He'll do this until all of the pieces are gone, but he won't eat them. Do any of your rats do something similar to this?
Lol, no, but it's kind of funny cuz Frisco hads three floors to his cage, and Icarus has three cages put together (like a big one ) And they will take what they think is best from their food, then make the big trip all the way to the other side of their cage where they will continue to eat it heehee

If you do tie up the rawhide, it's easier to tie it with a strong wire or something that they can't just chew off easily so the rawhide falls lol. Iused to tie it up with yarn until I figured out their secret Now I use the metal holders for water bottles - I just hang them from the roof!

I know that the heart shaped kind of rawhide is by Fortum. I think they are a pretty good company? Not too sure, but my pet store sells them for fairly cheap, and they are pretty lol..
The rawhide chips are by Petcetera, but that's a Canadian company, and I'm not sure about the others, because they aren't in a package, they are just set out in jars..for free heehee