Although the Wildlife In Need Center answers nearly 10,000 phone calls each year and has admitted over 36,000 wildlife patients representing over 140 species that are native to Wisconsin, we often get calls like these as well because very few other agencies and nonprofits in the area are equipped to answer these types of questions. Unfortunately,
...even if the animal in question is considered “exotic” and may be difficult to find advice on through traditional resources. What we can and always try to do is help these individuals to seek out the resources that might actually be beneficial for their individual situation.
Resources page for links to helpful people in these situations. Both the caller and I were grateful that he’d called before releasing these turtles in a pond down the road from his house. I was able to direct him to contact one of several reptile specialty breeders in the area to see if they would be willing to help find suitable new homes for them instead.