There’s not much life up high this time of year. Or at least, that’s the impression you get as you push through shifting sprindrift and up wind-scoured ridges. You can easily buy into the notion that there’s only you up there. As far as you’re concerned, you’re the only creature mad enough to try. But it’s often at times like those, when the wind is raging and you feel the need to keep moving to stay warm, that a small, plump white bird crosses your path. It’s never the case that I catch advance sight of its silhouette on a…