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Fig 1) The eye is already pale, but the bill is still pink. Dec 30, 2011. Davis, California. Photo by Steve Hampton.
|Fig 2) The pale eye is the primary indicator of age here. The adult gray back is so pale it is difficult to discern, especially in the bright sun. January 25, 2013. Tiburon, California. Photo by Steve Hampton.|
|Fig 3) It was hard tell if this was second or third cycle. There are adult gray feathers in the mantle, and a pale eye, but the bill is still the same as first cycle. The size difference between this apparent male and the female Thayer's Gull in front of it is astounding. March 16, 2011. Davis, California. Photo by Steve Hampton.|