Grebe sp.

This photo of a what I think is a horned grebe (next to a RUDU) was taken at Emmett Wastewater Treatment Plant 9/12/21.  I have not been able to ID it.  The eye color told me it was a horned grebe but just didn’t feel confident.  There were others that definitely looked like horned grebes and eared grebes in a mix with RUDUs.  Would love someone to tell me what it is and why.

Thanks,

Liz Medes
Gem County

Home of Idaho Birding and the Idaho Bird Records Committee