Digit 2 of the duck wing has a genuine tip.

<p>A: The pattern of ossification (alizarin red staining) of the last phalanx of digits 1 and 2 is distal (arrows). B: (a) Fresh wing specimen, showing the evident claw at the end of digit 2 (arrow). (b,c) In situ hybridisation showing <i>Bambi</i> expression at the tips of duck digits at E13. (b) Expression is detected in wing digits 1 and 2 (arrowheads). (c) In the leg, <i>Bambi</i> is expressed in all toe tips.</p>