At the moment, Susan Myers is doing a series on the Best 50 Birds in Asia. Susan, the Wallcreeper is the bestest bird in the whole wide world. And it occurs in Asia. So you better put it on your list!
Noting that I am obsessed with these silly little cliff running butterflies, I have been thinking a fair amount about them lately as the winter snows have increased. The bulk of our Wallcreepers (Tichodroma muraria) in Tirol, live up in the high alpine region, one the cliffs ridging the mountains and by November, these are in deep snow.
So what happens to the Wallcreepers in winter?
Well, we know that in Winter many individuals become nomadic, turning up on cathedrals and stone quarries all around Europe and Asian and oftentimes well away from the closest breeding areas. And we know that some stay in the lower altitude cliffs, canyons and gorges in the Alpine region (where they also breed), but I suspect that even though they also breed in these areas, I suspect that their home-ranges increase in size (where possible) and that many individuals are simply nomadic and that the Wallcrepers we see in a breeding area in winter are not necessarily the same ones that breed there in June.
But for me, one of the most remarkable observations is from a friend who has an Alpine hut / guest house at almost 2000m and last year, he had at least one Wallcreeper around his house and on the nearby cliffs ALL WINTER! And this winter it is back. Very cool. But how on earth do they do it? Find little insect food in such a snowy environment?
Maybe hunting is not the best way to describe what they do, but Wallcreepers are really fascinating to watch. Those bright crimson wings, with white spots, are perfect insect scaring tools. They creep along the cliff faces flicking their wings to get their surprise their insect prey in to moving – pretty much the best way to flush out well-camoflaged food in a hurry. They seem to have two different types of wing flick. There is the first which is a simple in-out, much like many flycatchers, chats, and numerous other insectivores. Then there is the really exciting, crazy wing flick where the Wallcreeper flicks with such enthusiasm and energy that the bird almost tips itself over:
The Wallcreeper seems to use a wide variety of different holes/spaces/cracks for breeding. Here is some digiscoping video footage that I made of a Wallcreeper nest last year:
Wallcreeper call / song
The high pitched whistle is not the most melodious of calls, but I find it beautiful. In my experience, they call very rarely and for the most part, this is lost in the space of the mountains (doesn’t travel far) or is drowned out by the sound of rushing water (when in a canyon). This morning I read a fascinating article in which the authors show similarities in the calls of the Wallcreeper and a number of high-altitude Himalayan stream frogs, all living in very similar habitats (Dubois & Martens 1984). The authors suggest that this is a result of convergence call evolution based on the acoustic constraints of the steep gorges with loud, fast flowing streams.
The crimson butterfly
All images digiscoped/videoscoped by Dale Forbes (c) with a Swarovski telescope. Please do not copy.