This piece of film, which I've just found on YouTube, might be of interest; It features the northern white rhinos "Paul" and "Chloe" that arrived at Antwerp Zoo in 1950. ("Chloe" was still at Antwerp on my first few visits there in the 1980s.) northern white rhinos
thank you very much for sharing this piece of history Tim May ! Chloe is the one and only Northern white rhino I've seen alive.