Andy Rouse / 2020VISION / European river otter (Lutra lutra) swimming, Dorset, UK, May. Did you know? Following efforts to save them from extinction, otters have now returned to every county in England – proof that conservatio...

Mark Carwardine / Northern white rhinoceros (Ceratotherium simum cottoni) with horn removed, after initial release into the wild, Ol Pejeta Conservancy, Kenya, June 2010, Extinct in the wild, only eight left in captivi...

Mark Carwardine / Northern white rhinoceros (Ceratotherium simum cottoni) close-up of eye, Dvur Kralove Zoo, Czech Republic, December 2009, Extinct in the wild, only eight left in captivity, critically endangered, Part...

Mark Carwardine / Northern white rhinoceros (Ceratotherium simum cottoni) close up of eye, in enclosure at Dvur Kralove Zoo, Czech Republic, the day before departure, December 2009, Extinct in the wild, only eight left...

Ann & Steve Toon / Member of the Rhino patrol, partly funded by Save the Rhino international, looks out using binoculars, Lewa Conservancy, Laikipia, Kenya, September 2012

Ann & Steve Toon / Anti-poaching patrol supported by Save the Rhino International, Mbirikani Group Ranch, Amboseli-Tsavo ecosystem, Chyulu Hills, Kenya, Africa, October 2012

Pat Tuson / Islington Green Party Banner at the Save the Whittington Hospital A&E March, Archway, London Borough of Islington, UK

Ann & Steve Toon / South African church with save the rhino anti-poaching slogan on electronic advertising billboard, Klerksdorp, North west province, South Africa, June 2012. Editorial use only

Ann & Steve Toon / Save the Rhino Trust tracker, Dansiekie Ganaseb, recording black rhino sighting, Palmwag concession, Kunene region, Namibia, May 2009. Editorial use only

Ann & Steve Toon / Save the Rhino Trust tracker Dansiekie Ganaseb, recording black rhino sighting, Palmwag concession, Kunene region, Namibia, May 2009. Editorial use only

Ann & Steve Toon / Save the Rhino Trust tracker, recording black rhino sighting, Palmwag concession, Kunene region, Namibia, May 2009. Editorial use only

Ann & Steve Toon / Save the Rhino Trust trackers, Erwin Karatjiva (crouching) and Dansiekie Ganaseb(right), with Wilderness Safaris guide Gotlod Hawaxab (left), recording black rhino sighting, Palmwag concession, Kunene...