Among birds, the white-tailed ptarmigan (Lagopus leucurus) are present on Rollins Pass, especially above treeline. Their seasonal camouflage is effective in the summer against the exposed blocks of granite as well as against snow in the winter, rendering them virtually undetectable. Brown-capped rosy finches (Leucosticte australis), rock wrens (Salpinctes obsoletus), and pipits are also seen or heard at timberline and near the summit.