Perching On A Spiky Branch

I captured this image during my safari trip in East Africa in 2019. I don’t know why this bird perched on a spiky branch. I don’t know the nomenclature of this bird. I would be greatly appreciated if you are aware and share with me. My perception to capture the image is based on the posture of bird and the brilliant lighting on the subject. I think this is the usual features that I search for before I capturing the image.