Parasites are often able to manipulate their host behavior by either manipulating its host physiology or interrupting its molecular process.  Behavior alterations benefit the parasite as passing to its new host, will allow it to complete its lifecycle. In previous studies Microphallus sp. has been showed to affect Potamopyrgus antipodarum a New Zealand freshwater snail behavior in its foraging behavior (1). Here we, hypothesize that the worm will change the behavior of the snail, particularly its’ personality, in a way that will allow it to be the prey of its next host, the duck. We expect to see changes in the snails’ fitness and personality, which we have indicated as “shyness” and righting as early as a month post parasite-exposure. Snails are exposed to the parasite via duck feces, which contain larvae of the parasite Microphallus sp. And infection is track over the course of three months. Righting and shyness assay were condcuted at different temperatures (16 ºC, 22 ºC, 30 ºC) to observed snails resistance to temperature fluctuations. All data is analyzed using Statistical Analysis Program (SPSS) and this will allow us to compare the differences of behavior at various environmental conditions throughout the course of infection. Future work includes analyzing parasite and snail DNA to be able to determine how early the infection occurs. It is critical to understand host-parasite relationships as it provides an insight via molecular and behavioral data of this complex interaction.