The Guardian article is written by someone who is most likely a freelance writer. Their goal is to pump out articles that make attention grabbing claims while staying truthful. The author was not a rhino expert and likely didn't do much journalism research to find the facts people need to know, but some sob story about the last of it's kind is better news (more shares, more likes, more viewers, more ad revenue).
"The Guardian article is written by someone who is most likely a freelance writer"
The Guardian writer, Jonathan Jones, is the art critic for the newspaper. Hence, the links to art history and a very descriptive interpretation of the rhino in the picture ("His head is a marvellous thing. It is a majestic rectangle of strong bone and leathery flesh, a head that expresses pure strength").
The article is part of a series called 'Framing the debate' which the site describes as follows:
"A great photograph doesn't only say more than a thousand words, it can also create a hundred different reactions. In this series we take a close look at contemporary and historical photographs and videos that divide opinion"
Source? Why is the Guardian article framing Sudan as the species' last chance if this is the case?