Wingtip

They're wonderful hoverers, though, and they'll remain stationary in the air, wing-tips vibrating, till they've marked their prey[.]

The poor but lovely bird sat there, posing among the celandines and wood anemones, wondering why its wing-tips were frozen together.

Then, immaculately dressed in three-piece suit, starched collar, and wingtips, Wilbur was obliged to drive a spike of Nevada silver into a railroad tie, a tricky and potentially embarrassing ceremonoial duty, especially with a phalanx of eager photographers poised to record every misswing.