Here is a page with all the aging and sexing of RT Hummingbirds.
I think you are seeing pollen on the bill perhaps.


Date:    Thu, 26 Aug 2010 17:32:42 -0400
From:    Maeve Kim <[log in to unmask]>
Subject: hummingbird bills?

Hummingbirds are clearly preparing for their long journeys, often
spending as long as two minutes at one feeder perch - very unlike
their eat-and-run habits of earlier in the summer. The birds that
I've identified as juveniles all have a great deal of white at the
base of their bills, extending more than a third of the way along the
bill. I don't see this in Sibley or the National Geographic bird
guide. Has anyone else noticed white bills?

Maeve Kim
Jericho Center


Kent McFarland
Vermont Center for Ecostudies
PO Box 420  Norwich, VT 05055