Much has been written on Passle and elsewhere on the near-extinction of various species of rhino. The news is, invariably, bleak. But I was particularly struck by this recent photograph of and story about Sudan - the very last male northern white rhinoceros (Ceratotherium simum, a.k.a. square-lipped rhinoceros) in existence.

I think it's an incredible image, both photographically, and in terms of what it signifies. It's the very last of something; a beautiful and unique creature that will likely soon vanish forever - and because of human cruelty and stupidity. A majestic beast that has to be protected round-the-clock from murderous poachers by brave, caring guards armed with gigantic rifles. The image is almost apocalyptic.

If you'd like to find out more about (or support) the brave rangers who protect Sudan and other rhinos, see here.