I have to be careful too. Last year a friend and I were looking at snakes, mostly E. garters and N. water snakes, coiled in the grass, which can be pretty dark, and came across a massasauga. It was very dark, opaque, and coiled so the rattle wasn't showing. As my bud ran up to check it out I yelled rattler! He jumped back just in time. We don't see them often, but you have to be ready:)
: I found this fox snake yesterday near Chicago. It was one of the prettier ones I have found, lots of copper/orange. When I first saw it curled up in a clump of grass I thought I stumbled upon a Massasauga, as I was in an area where they are rumored to inhabit.