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...

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.

Paul D Stewart / Portraits of Cowslip (Primula veris) flowers, pin and thrum eyed, showing heterostyly ie stigma at different positions. This was noted by Darwin and shows a mechanism to avoid self fertilisation.

Alex Mustard / Underwater photographer Alex Mustard taking a self-portrait with a friendly young grey seal (Halichoerus grypus). Farne Islands, Northumberland, England, British Isles. North Sea. Model released.

Danny Green / Willow Grouse (Lagopus lagopus) male perched on snow, Finland, March. Bookplate from Danny Green's 'The Long Journey North'

Anup Shah / Celebes / Black crested macaque (Macaca nigra) sub-adult male self grooming, Tangkoko National Park, Sulawesi, Indonesia.

Anup Shah / Celebes / Black crested macaque (Macaca nigra) sub-adult male sitting on a fallen branch self-grooming, Tangkoko National Park, Sulawesi, Indonesia.

Fiona Rogers / Western chimpazee (Pan troglodytes verus) young male 'Jeje' aged 13 years self-grooming, Bossou Forest, Mont Nimba, Guinea. January 2011.

Andy Sands / Clouded yellow butterfly (Colias crocea) on Self heal flower (Prunella vulgaris), captive, UK, July

Fiona Rogers / Bornean Orang-utan (Pongo pygmaeus wurmbii) young mature male 'Gary' aged 16 years self grooming. Camp Leakey, Tanjung Puting National Park, Central Kalimantan, Borneo, Indonesia, July 2010. Rehabilit...

Jose Schell / Self heal plant {Prunella vulgaris} Anticosti Is, Canada

John Cancalosi / Western hog nose snake feigns death for self-defense. Gray Ranch NR, USA