Where are the rhino's?

We promised Mum and Dad Rhino’s in the Motopo’s – when we visited before there were two at the gate, the attendant at the game park assured us she had seen 12 the day before.  But nothing.  The rhino's are in the Matopo's park (where we'd previously spotted them), but in determination to see them we also went to the game park.  Nothing.  Clearly, today wasn't the day for game.   The park is renown for it's rock formations, especially this one, however everywhere are rocks that somewhat defy belief that they don't topple over.