Ticks are an ecternal form of parasite that feed on blood by puncturing through the animal's skin. They first evolved during the Cretaceous period, up to 145 million years ago.
Infection comes from close proximity to other infected dinosaurs, or compromised sites. While not necesaarily dangerous to themselves, they can be a vector for further blood-borne disease.
- The Ticks disease previously appeared in Jurassic Park: Operation Genesis, considered by many to be Jurassic World Evolution's spiritual predecessor.