Espen Bergersen / Adult male King eider (Somateria spectabilis) portrait, Batsfjord, Norway, March.

Paul D Stewart / 'Martha' the last passenger pigeon, (Ectopistes migratorius), who died Cincinnati Zoo, September 1st, 1914. This portrait of her published in March 1915 as the Frontispiece to William Hornaday's 'The...

Tim Laman / Self portrait of biologist / photographer, Tim Laman, climbing a rope into the rainforest canopy in Borneo. Gunung Palung National Park, Borneo, West Kalimantan, Indonesia

TJ Rich / Wilsthire horn sheep with self shedding fleece, portrait. Surrey, England, UK.

TJ Rich / Wilsthire horn sheep with self shedding fleece, portrait. Surrey, England, UK.

TJ Rich / Wilsthire horn sheep with self shedding fleece, portrait. Surrey, England, UK.

TJ Rich / Wilsthire horn sheep with body bare of self shedding fleece, portrait. Surrey, England, UK.

TJ Rich / Wilsthire horn sheep with body bare of self shedding fleece, portrait. Surrey, England, UK.

Sven Zacek / Self portrait of photographer holding photograph of the same woodland scene taken the previous day. Lahemaa National Park, Laane-Virumaa, Northern Estonia. May 2016.

Andy Sands / Beech Tree (Fagus sylvatica) ancient coppice stool uncut for several generations self portrait to show scale, Essex, England, UK, November

Andy Sands / Photographer Andy Sands with Beech Tree (Fagus sylvatica) ancient coppard - old coppice stool that was then pollarded and has since not been cut for several generations self portrait to show scale, Es...

Ashley Cooper / Nepalese woman in traditional clothing weaving cloth on a hand loom in the Himalayan foothills, Nepal. January 2013.