I have not seen this very often but just occasionally you will see a wader (usually one with a long bill) flex the end of the bill up as if it were a finger rather than the percieved hard, tough chitinous bill!
Knew it began with Rh but has taken ages to find it so here is the definition straight from Wikipedia: Rhynchokinesis is an ability possessed by some cranes, waders, swifts and hummingbirds to flex their upper…