Every organism that exists today has at least one parasitic species that lives on or in it. Therefore, it isn’t surprising that extinct organisms had parasites, too. We could learn a lot about parasite evolution by studying parasite fossils, but studies of prehistoric parasites aren’t particularly common – in part because tiny, soft-bodied parasites don’t fossilize well. We do have some fossil evidence for prehistoric parasites, though, and you can read all about it in Tommy Leung’s recent paper and/or blog post. Bon appétit!