rhamphotheca: Rocky Mountain National Park - CO, USA Ptarmigans, like these White-tailed Ptarmigans (Lagopus leucura), are adapted to blending into their surroundings. Soon their winter plumage will molt away and darker feathers will emerge allowing them to blend into their summer rocky, alpine environment. (SL) (NPS photo) - http://jenn2d2.tumblr.com/post...