That looks just like something I've gotten before when I bought my rats from a local supplier. It's hard to tell from that distance, but the ones on mine turned out to be spined rat lice. According to the people on the forum I asked, it would have been fine to feed, and many rats have a couple on them, but the fact that the rat was covered in them meant that the rat may have been sick and not grooming itself. I never knew if it would have been safe to feed or not, because I took it back to the store and got my money back. Personally, I always try to be as careful as I can.
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