Hunting club raises money to save black rhino... by hunting a black rhino

[Clueless Morgan]

Why not, just tranquilize the older, territorial rhinos and move them somewhere else away from the fertile females? Say, to a heard of older, infertile females.

Rhinos aren't a species that go through menopause. To my knowledge, female rhinos are fertile until their death so there would be no moving the older males to a herd of infertile females - which is futile anyway: Black Rhinos are solitary.