Rh factor is also called "Rhesus factor" because it was first discovered in the blood of Rhesus monkeys. There are 612 primate species and subspecies recognized by the International Union for Conservation of Nature (IUCN), and not one has Rh negative blood.
If mankind evolved from the same African ancestor their blood would be compatible, but it is not. Nearly 85% of all human beings have RH positive blood, yet ALL royal families have Rh negative blood. Where did the Rh negatives come from? Why does the body of an Rh negative mother carrying an Rh positive child reject her own offspring?" - Robert Sepehr