Greater White-fronted Goose, Anser albifrons
Adults, above, and below, flying, with white at the front of the face, and black patches underneath.
A juvenile, brown, without the white front or the black patches.
Adult, left, with juvenile, right.
Above, beginning transition to adult plumage in January of first cycle, with white front just starting to come in, no black patches yet.
Adult and juvenile birds flying together.