Helping keep the rodent and bug population down. Saw this guy Sunday afternoon near the start of the ice loop. He laid motionless till I tried to touch his back, then he hissed, coiled in strike position, and made a sound similar to a rattlesnake. He is watching me and moving for grass cover. This one is a little over 2'. A couple years ago I saw one on the central trail just before the nursery that was probably 4'.