After talking to Nick K. and studying the photosI've concluded the juvenile gull was a 1st cycle California Gull based on its bicolored bill, long narrow wings, and plain base of outer greater coverts. Lesser Black-backed Gull is the call on the adult from the smaller white trailing edge on the wings, dusky base of secondaries and primaries leading into dark wingtips, slaty grey upperparts contrasting with black wingtips, yellow legs and bill. Although the bill seemed too large to me, Nick suggested it could be a larger bill of a mature male. Gulls can be so humbling!
David WadeFort Collins
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