A bird in the sky can sometimes take on a shade of blue so then you have to correct the entire bird. You can correct it in the same way as a partial colour cast. So:
- Take your image to Photoshop;
- Select the bird and jump it to its separate layer (cntrl or cmnd J);
- Open the fx menu and change the blending mode to Color Overlay;
- Reduce opacity to 0% and click the rectangle to open the Color Picker;
- Sample the correct colour and click OK;
- Set the blending mode to Color;
- You can play with the opacity here or later in the layers panel (where you can also add a mask if necessary).
The result on a Jackdaw:
Before (unprocessed):
After (colour corrected and processed):
And of course another clip to show the procedure.