Well,....actually I don't think you can, at least not from a photo. I mistakenly labelled as a female but it should be a non-breeding. I've need to made that change so others are not misled, thanks, JW.
How can you tell that the Horned Grebe is a female?
BTW we were at Saddington yesterday and saw the Western Grebe. We saw Horned and Red-necked there as well.