Which state is identified as a shared zone where both *P. vulpinus* and *P. gloydi* can potentially be found?
Answer
Illinois
Illinois is explicitly mentioned as a shared state where *P. vulpinus* inhabits the northern parts and *P. gloydi* is found in the northeastern portion, requiring close examination of specific counties.

Related Questions
Which fox snake species maintains a stable presence in Minnesota today?Where is the Western Fox Snake (*P. vulpinus*) generally distributed within Wisconsin?Which state is identified as a shared zone where both *P. vulpinus* and *P. gloydi* can potentially be found?What is the documented range for the Eastern Fox Snake (*P. gloydi*) in Canada?In which state is the Western Fox Snake (*P. vulpinus*) documented in the southern part of its range in the east?What geographical feature generally links the distribution of both fox snake species?Where is the Eastern Fox Snake (*P. gloydi*) specifically found in Illinois?What key characteristic defines the distribution of the Western Fox Snake (*P. vulpinus*) compared to the Eastern Fox Snake?Why is recognizing specific county or regional restrictions vital for ecological monitoring of these snakes?In which state is the Western Fox Snake (*P. vulpinus*) historically suggested to have had a broader range than currently observed?