Dutch Birding volume 28 (2006) no 1

Red-rumped Swallow with aberrant moult pattern in Gelderland in April 2005
On 5-6 and 16-17 April 2005, a Red-rumped Swallow Cecropis daurica showing worn flight-feathers was observed at two sites close to each other in Gelderland, the Netherlands. On 16-17 April, the bird appeared to have shed its inner primaries. As far as known, this was the first example of spring primary moult in this species for Europe.

Rik Winters, Aquamarijnstraat 60, 9743 RB Groningen, Nederland
(gagelplanet.nl)