The Royal Wildebeest / Royal King Wildebeest (also known as ghost wildebeest) is the most rare colour variant of all the blue wildebeest variants. There are an estimated 20 – 30 in the world. Currently there are only five breeders actively breeding with the Royal Wildebeest. The colour variants are not to be confused with subspecies, they are also not hybridised through cross breeding of the various subspecies.
The top left photograph is of a Royal King Wildebeest Bull and in this photo he appears slightly red because he rolled in the wet sand. He is actually more white as you can see on the photo of the calf on the right.