I was outside of the Philadelphia for Thanksgiving Weekend. Friday we visited Audubon's home at Mill Grove near Valley Forge. In the millpond on Perkiomen Creek in front of the home, I photographed this Greater White-fronted x Canada Goose hybrid. However, since this is the first such hybrid I have seen, if anyone thinks otherwise, please let me know.
The Mill Grove museum included an original folio opened to Canada Goose, other displays about Audubon, and this sorta restored study room. I include this photo because of the powder horn on the bed, reminding us that ornithology in Audubon's day was pursued with a shot-gun. Undoubtedly Audubon would have "collected" the hybrid specimen. I wonder if he would also have thought it another species. After he all, he did not have Sibley, Peterson, Stokes, the internet, and a host of other resources to consult.