Thankfully, Illinois and Wisconsin don't have to deal with many of those nightmare fuel creatures. While neither Illinois nor Wisconsin is home to an abundance of deadly predators, both states still have animals capable of causing serious injuries or worse. Photo by Michael Jerrard on Unsplash brown snake on brown soilHere In Illinois, Our Deadliest Animal Is About The Size Of A Medium DogAccording to the report, Illinois' most dangerous animal is... the coyote. Iowa's most dangerous animal is the wasp, thanks to potentially life-threatening allergic reactions from stings. The list is a good reminder that the most dangerous animal isn't always the biggest or fiercest.