By the time i was able to get close enough the sun was getting a little to high so the light isn't ideal. This is the best could do before the sun got any higher.
5dIII 400 f5.6L
1/1600 , f7.1
converted with DPP and then in PS. Neat noise reduction on the background , reduced saturation on the red shoulders and raised shadows a bit on the bird to try and get a little more detail in the dark feathers.