As I was watching some birds, I saw this eastern chipmunk come running along, mouth stuffed full of material to build a cosy winter nest. The chipmunk just stood and watched me for a long time and it was just beginning to dawn on me that there might be a den entrance nearby and I should move, when he dove off the rocks and headed straight down a small hole almost at my feet, that I hadn't even seen, so covered with grass was it.