Paul D Stewart / 1881 portrait of Charles Robert Darwin (12 February 1809 - 19 April 1882) English Naturalist and author of the Origin of Species. 1922 Hand coloured portrait aquatint of Darwin by G. Sidney Hunt after...

Robert Thompson / Tranarossan Bay, near Melmore Head, Rosguill Peninsula, County Donegal, Republic of Ireland, August 2011

Robert Thompson / Cleg fly (Haematopa pulvialis) adult at rest on bog myrtle, County Antrim, Northern Ireland, UK, July

Robert Thompson / Variable damselfly (Coenagrion pulchellum) on reed stalk, Brackagh Moss NNR, Portadown, County Armagh, Northern Ireland, UK, June

Robert Thompson / Beach and cliffs east of Ballintoy village, North Antrim, Northern Ireland, UK, July 2011

Robert Thompson / Lighthouse on Fanad Head at sunset, County Donegal, Republic of Ireland, UK, August 2011

Robert Thompson / Razorbill (Alca torda) in flight, Great Saltee Island, County Wexford, Republic of Ireland, June

Kathryn Jeffs / Dr Robert (Bob) Pitman and Dr John Durban, scientific advisors, watching for Killer whales (Orcinus orca) on board the 'Golden Fleece', off Antarctic Peninsula, Antarctica, January 2009, Taken on loca...

Robert Thompson / A cascade of waterfalls falling over a cliff in woodlands. Plitvice National Park, Croatia, May 2010.

Robert Thompson / Aerial view of the Dooey Peninsula and Ballyness Bay north of Gortahork, County Donegal, Republic of Ireland, September 2009

Robert Thompson / Aerial view of Black Strand beach, Malin Head, looking towards Trawbreaga Bay, Malin Head, County Donegal, Republic of Ireland, September 2009

Robert Thompson / Aerial view of cliffs at Bunglass bay, Slieve League, west of Kilcar and Killybegs, County Donegal, Republic of Ireland, January 2009

Robert Thompson / Aerial view of Carrickarade Island, County Antrim, Northern Ireland, UK, September 2009

Robert Thompson / Aerial view of the Dooey Peninsula and Ballyness Bay, north of Gortahork, County Donegal, Republic of Ireland, September 2009

Robert Thompson / Aerial view of Malin Head, looking east towards Breasty Bay, County Donegal, Republic of Ireland, September 2009

Robert Thompson / Aerial view of the Mussenden Temple and beach, Castlerock, north coast, County Antrim, Northern Ireland, UK, September 2009

Robert Thompson / Aerial view of Portbraddan and Whitepark Bay, north coast, County Antrim, Northern Ireland, UK, September 2009

Robert Thompson / Aerial view of the East Lighthouse, Rathlin Island, County Antrim, Northern Ireland, UK, September 2009

Robert Thompson / Aerial view of the East Lighthouse, Rathlin Island, County Antrim, Northern Ireland, UK, September 2009

Robert Smith / Diver exploring a freshwater Limestone sinkhole / Cenote called 'The Pit' - a traverse to 'The Blue Abyss' with stalactites and stalagmites, Tulum, Quintana Roo, Mexico, September 2008. Model released

Robert Thompson / Long John Silver stalactite in the Marble Arch Caves, Enniskillen, County Fermanagh, Northern Ireland, UK, January 1995

Robert Thompson / Green-veined white butterfly (Pieris napi) resting on Bluebell flower, Clare Glen, County Armagh, Northern Ireland, UK, May

Robert Thompson / Small emperor moth (Saturnia pavonia) on Speedwell flowers, Annagarriff Wood NNR, County Armagh, Northern Ireland, UK, May

Robert Thompson / Early thorn moth (Selenia dentaria) camouflaged as dead leaf on stem, Argory, County Armagh, Northern Ireland, UK, March

Robert Thompson / Buff-tip moth (Phalera bucephala) camouflaged on branch, Lackan Bog, County Down, Northern Ireland, UK, June

Robert Thompson / Buff ermine moth (Spilarctia luteum) resting on grass, Ireland

Robert Thompson / Buff arches moth (Habrosyne pyritoides) resting on branch, camouflaged, Lackan Bog, Ballyroney, County Down, Northern Ireland, UK, July

Robert Thompson / Brackagh Moss NNR in winter, Portadown, County Down, Northern Ireland, UK, January 2003

Robert Thompson / Emperor dragonfly (Anax imperator) resting, Hampshire, UK, June,

Robert Thompson / Amethyst deceiver (Laccaria amethystea / amethystina) growing up through moss, Tollymore Forest, County Down, Northern Ireland, UK, October

Robert Thompson / Bladder wrack seaweed {Fucus vesiculosis} Northern Ireland, UK

Robert Thompson / Kentish glory moth {Endromis versicolora} from Deeside, Scotland, UK, February

Robert Thompson / Close up of head of Caterpillar larva of Eggar moth {Trabala vishnou} Phou Fa, Pongsali, north Laos.

Robert Thompson / Red-eyed tree frog {Agalychnis callidryas} resting in Bromeliad flower, Nicaragua, June

Wild Wonders of Europe / Relanzón / Herb robert (Geranium robertianum) flowering in lava field, La Geria area, Lanzarote, Canary Islands, Spain, March 2009

Wild Wonders of Europe / Tønning / Herb robert (Geramium robertianum) in flower, Roudenhaff, Mullerthal, Luxembourg, May 2009

Robert Valentic / Following the desert rains a Holy cross frog {Notaden benneti} comes to the surface after a long period underground, Nyngan, New South Wales, Australia

Kim Taylor / Herb Robert {Geranium robertianum} close-up of stamen and anthers, showing pollen grains, Surrey, England.

Staffan Widstrand / Robert Mulluk Sr, portrait, 73 years old, Kobuk Valley NP, Alaska, USA

Kim Taylor / Comma Butterfly (Polygonia c-album) feeding on ripe blackberries, UK.

Robert Fulton / Aerial view of melting glacier in mountains, Peru

Robert Fulton / Aerial view of mountain range in Torres Del Paine NP, Chile, South America

Robert Fulton / Aerial view of snow capped mountains, Torres del Paine NP, Chile

Robert Fulton / Aerial view of glacier near Lago Argentino, Argentina

Robert Fulton / Aerial view of Lago Argentino mountain range, Argentina,

Robert Fulton / Aerial view of mountains near Salar de Uyuni, Bolivia

Robert Fulton / Aerial view of mountains near Salar de Uyuni, Bolivia

Robert Thompson / Owly sulphur (Libelloides coccajus) on buttercup species (Ranunculus sp) Rugiano, Monte St Angelo, Gargano, Italy, April

Robert Thompson / Bee orchid (Ophrys bertoloniiformis) flowers, west of Monte San't Angelo, Gargano, Italy, April

Robert Thompson / Rocky mountain field in hills north of Mattinata, Gargano, Italy, April 2012

Robert Thompson / Roman orchid (Dactylorhiza romana) in woodland, north of Monte St Angelo, Gargano, Italy, April

Robert Thompson / Brindled green (Dryobotodes eremita) Argory, Derrycaw, County Armagh, Northern Ireland, UK. September

Robert Thompson / View of Adriatic Sea from the coastline northeast of Mattinata, Italy, April 2012

Robert Thompson / Puffin (Fratercula arctica) in flight, Saltee Islands, County Wexford, Republic of Ireland, June

Robert Thompson / Bee orchid (Ophrys promontorii) flower, north of Mattinata, Gargano, Italy, April

Robert Thompson / Cherry Bark Tortrix (Enarmonia formosana) Annagarriff Wood, Peatlands, County Armagh, Northern Ireland, UK. June

Robert Thompson / Scorpion (Euscorpius italicus), north west of Monte San't Angelo, Gargano, Italy, April

Robert Thompson / Bee orchid (Ophrys crabronifera) growing in roadside margin, Monte Saint Angelo, Gargano, Italy, April

Robert Thompson / Italian wall lizard (Podarcis siculus) north of San Nicandro Garganico, Gargano, Italy

Robert Thompson / Gannets (Morus bassanus) Saltee Islands, County Wexford, Republic of Ireland, June

Robert Thompson / Common toad (Bufo bufo) among leaf litter, North of Monte St Angelo, Gargano, Italy, April

Robert Thompson / Black and red froghopper (Cercopis vulnerata) East of Monte St Angelo, Gargano, Italy, April

Robert Thompson / Northern fulmar (Fulmarus glacialis) nesting pair, Saltee Islands, County Wexford, Republic of Ireland, June

Robert Thompson / Owly sulphur (Libelloides coccajus) on grape hyacinth (Muscari) flower, Rugiano, Monte St Angelo, Gargano, Italy, April

Robert Thompson / Man orchid (Orchis anthropophora) in flower, north of Monte St Angelo, Gargano, Italy, April.

Robert Thompson / Bee orchid (Ophrys garganica) Rugiano, Monte St Angelo, Gargano, Italy, April

Robert Thompson / Scorpion (Euscorpius italicus) catching catepillar, north west of Monte San't Angelo, Gargano, Italy, April

Robert Thompson / Orchid (Ophrys tenthredinifera) Rugiano, Monte St Angelo, Gargano, Italy, April.

Robert Thompson / Italian wall lizard (Podarcis siculus) north of San Nicandro Garganico, Gargano, Italy

Robert Thompson / Italian wall lizard (Podarcis siculus) north of San Nicandro Garganico, Gargano, Italy, April

Robert Thompson / Orchid flower (Ophrys argentaria), on roadside margin, Mt Argentario, Italy, April

Robert Thompson / Brindled green (Dryobotodes eremita) Argory, Derrycaw, County Armagh, Northern Ireland, UK. September

Robert Thompson / Razorbill (Alca torda) adult carrying a beak full of sand eels, Saltee Islands, County Wexford, Republic of Ireland, June

Robert Thompson / Bee orchid (Ophrys bertoloniiformis) flowers, north of Mattinata near near Monte Sacro, Gargano, Italy, April

Robert Thompson / Sawfly Orchid (Ophrys tenthredinifera) Rugiano, Monte St Angelo, Gargano, Italy, April.

Robert Thompson / Bee orchid (Ophrys parvimaculata) flower, north east of San Nicandro Garganico, Gargano, Italy.

Robert Thompson / Razorbill (Alca torda) portrait, Saltee Islands, County Wexford, Republic of Ireland, June

Robert Thompson / Pink butterfly orchid (Anacamptis papilionacea) North east of San Nicandro Garganico, Gargano, Italy, April

Robert Thompson / Orchid (Orchis puciflora) in flower, north of Monte St Angelo, Gargano, Italy, April

Robert Thompson / Paper wasp (Polistes gallicus) on nest, north of San Nicandro Garganico, Gargano, Italy, April.

Robert Thompson / Bee orchid (Ophrys sipontensis) flower, Rugiano, Monte St Angelo, Gargano, Italy, April

Robert Thompson / Bee orchid (Ophrys parvimaculata) flower, north east of San Nicandro Garganico, Gargano, Italy.

Robert Thompson / White park bay, North Antrim coastline, Northern Ireland, UK. December 2012

Robert Thompson / River Shimna, Tollymore Forest Park, Newcastle County Down, Northern Ireland, UK. September 2012

Robert Thompson / River Shimna, Tollymore Forest Park, Newcastle County Down, Northern Ireland, UK.September 2012

Robert Thompson / Slime mould (Fugio septica) growing on decaying birch stump, Annafarriff Wood NNR, Peatlands, County Armagh, Northern Ireland, June

Robert Thompson / Slime mould (Fugio septica) growing on decaying birch stump, Annafarriff Wood NNR, Peatlands, County Armagh, Northern Ireland, June

Robert Thompson / River Shimna, Tollymore Forest Park, Newcastle County Down, Northern Ireland, UK. October 2012

Robert Thompson / Sheep island, North Antrim coastline photographed from Larrybane, Carrick-a-Ree, Northern Ireland, November 2011

Robert Thompson / River Shimna, Tollymore Forest Park, Newcastle County Down, Northern Ireland, UK. October 2012

Robert Thompson / Ross castle, Lough Lean lower, Killarney national park, County Kerry, Republic of Ireland, October

Robert Thompson / Pale tussock moth (Calliteara pudibunda) Annagarriff Wood, Peatlands, County Armagh, Northern Ireland, UK. November

Robert Thompson / Macgillycuddy's reeks and Lough Lean lower, photographed from Ross castle, Killarney, County Kerry, Republic of Ireland, November 2011

Robert Thompson / Macgillycuddy's reeks and Lough Lean lower, photographed from Ross Castle, Killarney, County Kerry, Republic of Ireland, November 2011

Robert Thompson / Lough Lean lower, with Innisfallen island and Macgillycuddy's reeks, photographed from Cherry Island, Killarney, County Kerry, Republic of Ireland, June 2012

Robert Thompson / Green carpet (Colostygia pectinataria) Annagarriff Wood, County Armagh, Northern Ireland, UK. November