If anyone has been out to see the Western and possible Clark’s Grebes at 
Stern’s Lake (Boulder County) I’d love some thoughts on how you determined a 
Clark’s ID.  Additional commentary also welcome from others who would like to 
lend their expertise.

The two grebes I saw both fit Western or Intermediate but not Clark’s.   Flanks 
on both birds were dark (suggesting Western).  Bill color wasn’t different.  
Both birds had eyes clearly with the dark supercillium area, with the suspected 
Clark’s having some white in the lores.

Thoughts?

Regards,

Mark Minner-lee 
Erie, CO

Sent from my iPhone

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