The Addax Antelope is originally from Africa.  Being white with a gray masked face, his horns corkscrew up making 2 or more twists on both males and females.  A member of the oryx family, they are native to dry deserts and have do very well on game ranches in Southwest Texas.  A male can weight as much as 275 lb.s and female up to 200 lbs.   They both make good trophy mounts.