Identifying wildlife at night while driving can be challenging. The dark conditions and speed at which an animal goes out of view can make a positive ID difficult. Without seeing the animals myself, I'm not going to guess as to what species the animals were.
However, there are black foxes. There are three color phases in addition to the common red phase. The melanistic phase has black fur; the silver phase is black with white tips; and the cross phase is red with black across the shoulders and back. In Illinois, these color phases are rare in the wild.
