Great Grey Shirke

[Mangru Minz]

For the first time saw this bird perched on a overhead power line , outskirt of Bhopal.
1dmk3,ef 400mm DO with 1.4x tc at 1/4000 sec, f/6.3, Iso-800, Cropped

[Sabyasachi Patra]

Was the original image underexposed? There seems to be some noise in the body. Why 1/4000 shutter speed?