"Having the camera at the 'ready' always will offer an opportunity, especially near the beaches when noise is baffled by sea breezes and soft tundra to dampen foot fall.   These Bull caribou were trying to stealth their way past my camp,  But I caught them 'slinking' along....anyway!"  "No doubt many do get by me, especially when I am mesmerized by the vast numbers of migrating sea birds and Sandhill Cranes trumpeting their way overhead."