Tweeters,

The surest, most sensational place in North America to observe Black
Swifts is Ouray Colorado's Box Canyon. Sue Hirshman has had her eyes
on the colony there for 7000 hours the last eleven years. Her work is
recently published in the Wilson Journal and available here.

http://www.bioone.org/perlserv/?
SESSID=76429f206ff2c5659ff53bf0c2e54e2b&request=get-toc&issn=1559
-4491&volume=119&issue=4

Larry Schwitters
Issaquah