feathers

http://oregonstate.edu/dept/ncs/newsarch/2000/Jun00/birds.htm

http://www.sciencedaily.com/releases/2000/06/000625231641.htm

http://news.bbc.co.uk/chinese/trad/hi/newsid_800000/newsid_803800/803825.stm
http://dml.cmnh.org/2000Jun/msg00652.html