Re: Not much of a chemist then?
If it's in there accidentally it's possible the machine that makes the pellets uses a tallow based lubricant. That could be because a lubricant with a different base might have a negative reaction with the polymer, they save a nickel, or any number of other reasons like better yield, less maintenance, etc. Either way it's all speculation at this point and most importantly they've already been made so simply tossing them in the bin won't make the animal the tallow came from any better off.
I wonder if they are using E120 dye in those bills.