Two images. First (above) Mom and junior at 12.5 weeks. Note Mom still has a fully black head.
Dad and junior at 11.5 weeks. Note the white at the base of Dad's beak. Many of the Loons on the lake are now showing similar whiteness, they are probably starting to shed their summer plumage. Note also the film of water over Dad's head as he is in the process of surfacing.