Very nice capture with a good look back and an interesting perch. There is a bit of magenta/purple in the bird and branch. I did a Color Balance and moved Blue-Yellow toward Yellow, then Green-Magenta a bit toward Magenta, as the greens in the BG were looking a little overpowering.
David, this is a great look at this sparrow. The thorns on the perch and (of course) the bird are beautifully sharp, while the background sets both the perch and the bird off very well. I too think there’s a bit of a magenta cast.