HI:
This is from the New York Times:

Sexier Posterior Evolves Almost Overnight

November 30, 2004
By CARL ZIMMER



Male barn swallows with long tail feathers attract females,
and researchers have observed that those feathers have
become much longer.

http://www.nytimes.com/2004/11/30/science/30bird.html?ex=1103050569&ei=1&en=851dd6c44bbec82d

--
Ian Paulsen
Bainbridge Island, WA, USA
A.K.A.: "Birdbooker"
"Rallidae all the way!"