Rufous-crowned sparrow ? need id help Gross Reservoir, Boulder County, CO 5 23 2016

[Pieter Strauss]

Have attached 3 pix.  It looks like a rufous-crowned sparrow, but, for me at least, sparrows are very tricky.

Pieter Strauss

[Bill Prather]

Chipping Sparrow seems more likely.  The mustache stripe is much darker in Rufous-crowned. 

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