Amazing video of Rhino marking territory including a Flehmen grimace after female urinates

Amazing video of Male White Rhino marking territory including a Flehmen grimace after two female White Rhino urinate on his dung pile. A Flehmen grimace is where the male Rhino in this case, inhales the scent of the females urine over a gland on the upper pallet of his mouth. This is to test her readiness for mating. This is all part of Olfactory communication and the gland is called a Jacobson's organ or Vomeronasal gland.