- Group: Polymorphidae
The Polymorphys paradoxes happen to be yet another parasitic worm species. They tend to make hosts out of local crustaceans as their intermediate hosts. These are hosts that act as carriers for a parasite until it can be seen by its final host. In this case, a crustacean will make itself known due to being controlled by the parasite that infected it. A bird will then see the crustacean, which it will then attack and consume. With it goes the parasite, now inside the bird where it will reproduce. There is often no guarantee that a bird will just see a crustacean randomly.
Like other body-snatching parasites, the Polymorphus paradoxes will try to ensure a bird of any type will spot it. Thus, it will essentially take over the brain of the crustacean to remove it from the water or potentially ensure it is in shallow territories. This will improve its odds to be seen by the bird. However, unique among body-snatching parasites, there are not a whole lot of markers that help you indicate the parasite initially. Sure, it is there and can be seen if we view the crustacean closely but the bird would not spot any special differences.