When wallcreepers drop off a cliff, they typically bounce with closed wings, drop like a stone, and then plooff! open their wings in the classic butterfly pose with legs stretched down. I managed to get almost a full frame shot of this female doing just that (but it took me 1500 photos before I got it right ;-)
Digiscoped with Swarovski STM80 HD scope, TLS800 adapter & Canon 7D
Uncropped
Lots more wallcreeper photos here:
http://alpinebirds.blogspot.com/search/label/Wallcreeper