Avimor is a pretty good place to find Gray Partridges. The Chinese Well Riparian Area is a place I see them 50% or more of the times I visit. Last summer we had about three dozen of them including all the recent hatchlings. Local game bird hunters often refer to them as "Huns", short for Hungarian Partridge, giving us a clue that they were imported birds from Eurasia.
I felt pretty lucky to get these photos because usually I only see them when they flush and I catch a glimpse of their orange face and tail feathers.