BrentD: Riverbank Grape, eh? Thank you for that. Makes shockingly good grape jam. Unlike any other grape jam I've ever had. IMGUR is problematic tonight or I'd upload a shot of a handful of those berries you asked about. Another popular grouse food here is Grey dogwood, red stems on a viburnum-like bush with pearl-white berries.
Finally...got it.
I think the bigger multi-hue ones are the rosehips. We've never used the hawthornes before but they look so-similar to the rose-hips. I see both in bird crops here.
Pretty, eh?