All,
The Black Brant flew into Stearns Lake in southeast Boulder Co from the south at about 11:30. Was picked out in flight and identified by a very competent young lady named Mary (didn't get her last name).
Also present was the very interesting and beautiful goose that has been there a while. Photo from last Sunday by Leslie Sutton. I'm not sure whether this is a Ross's/Cackling hybrid or whether its parents are a blue phase and white phase Ross's Goose. The back is much darker than on all the other hybrids including Cackling Geese that I have seen this winter.
Peter Gent, Boulder.