Oscar Dewhurst / Fallow deer (Dama dama) walking across frost-covered playing fields at dawn, with tower blocks of London in the background. Richmond Park, London, UK. December

Matthew Maran / Lime trees (Tilia sp) and benches in snow, Kenwood Estate, London, UK, January 2013.

Matthew Maran / Sunset over snow-covered Hampstead Heath in winter, London, UK, January 2013.

Matthew Maran / Oak tree (Quercus robur) in snow, Hampstead Heath, London, UK, January 2013.

Matthew Maran / Mute swans (Cygnus olor) Highgate Ponds, Hampstead Heath, London, UK, February.

Matthew Maran / Great created grebe (Podiceps cristatus) with chick following, and person swimming in pond, Hampstead Heath, London, July 2014.

Luiz Claudio Marigo / Aterro do Flamengo, a park designed by Roberto Burle Marx, with Rio de Janeiro city and the Sugar Loaf mountain in the background, Rio de Janeiro State, Brazil, May 2011

Luiz Claudio Marigo / People taking photographs of a Brown-throated Three-toed Sloth (Bradypus variegatus) in Parque Centenario, downtown Cartagena de Indias city, Magdalena Department, Colombia, February 2011.

Terry Whittaker / 2020VISION / Visitor watching Grey heron (Ardea cinerea) and pigeons in Regent's Park, London, UK, April 2011, Model released.

Terry Whittaker / 2020VISION / Grey heron (Ardea cinerea) amongst visitors in Regent's Park, London, UK, April 2011. Photographer quote: 'It was fascinating to watch public reaction to the large numbers of herons in London's parks...

Terry Whittaker / 2020VISION / Grey heron (Ardea cinerea) beside visitor reading book on bench in Regent's Park, London, UK, April 2011. Model released.

Terry Whittaker / 2020VISION / Three Grey herons (Ardea cinerea) fighting in Regent's Park, London, UK, April 2011.