Placing a neutral control point in a white area on the leg and on the nose easily corrects WB in Nikon CaptureNX.
Original (upper left corner) posted by Jemini Joseph at DPReview Wildlife with D300 and AF-S 500/4.
Notice the RGB values of the watch points (lower right corner).
#0 (white spot on leg) : before 158/171/180, after 172/169/171
#1 (white spot on body): before 176/200/207, after 188/199/199
#2 (black nose) : before 35/59/71, after 52/57/60