Sibley has a website that will include information on subspecies
and changes at:
http://www.sibleyart.com/sibleyguide.htm
--
Mike Patterson Alas, to wear the mantle of Galileo,
Astoria, OR it is not enough to be persecuted
celata at pacifier.com by an unkind establishment,
you must also be right.
---Robert Park
http://www.pacifier.com/~mpatters/bird/bird.html