This small millipede was exactly at the water's edge and sometimes would extend his somewhat crooked front end onto the water, as if gathering floating material. Then he'd withdraw back onto the bank, move forward a bit, and again extend the front end onto the water's surface. Structurally he seems to be "hinged" at the front end, enabling him to often crook his front end, question-mark-like. Note the stump-like appendages between legs toward the front. This is where the "hinge" is. Often while traveling he'd raise his front end cobra-like, bending at that "hinge." Any insight into who this one is would be appreciated.