Jack Dykinga / Aerial view of border Wall between Arizona, USA. and Sonora, Mexico, a ten foot high wall which will be replaced by Trump's thirty foot high barrier. The wall passes through the pristine Sonoran D...

Jack Dykinga / Aerial view of border Wall between Arizona, USA. and Sonora, Mexico, a ten foot high wall which will be replaced by Trump's thirty foot high barrier. The wall passes through the pristine Sonoran D...

Jack Dykinga / Aerial view of border Wall between Arizona, USA. and Sonora, Mexico, a ten foot high wall which will be replaced by Trump's thirty foot high barrier. The wall passes through the pristine Sonoran D...

Angelo Gandolfi / Agricultural land which has replaced the natural Cerrado ecosystem. Goias, Brazil. 2010.

Sandesh Kadur / Glowing puffleg (Eriocnemis vestita) feeding from a bird feeder, replaced by a Chestnut breasted coronet (Boissonneaua matthewsii), Ecuador.

Ashley Cooper / Biofuel boiler in the grounds of the Langdale Estate, Lake District. Since the installation of the biofuel boiler, which replaced an LPG gas boiler, the company has saved 30,000 a year in running cost...

Ashley Cooper / Woodchip hopper for a biofuel boiler in the grounds of the Langdale Estate, Lake District,Since the installation of the biofuel boiler, which replaced an LPG gas boiler, the company has saved 30,000 a...

Ashley Cooper / Aerial view of deforested forest slopes replaced by farmland for subsistence agriculture in Malawi. March 2015.

Ashley Cooper / Aerial view of deforested forest slopes replaced by farmland for subsistence agriculture in Malawi. March 2015.

Ashley Cooper / Aerial view of deforested forest slopes replaced by farmland for subsistence agriculture in Malawi. March 2015.

Ashley Cooper / Aerial view of deforested forest slopes replaced by farmland for subsistence agriculture in Malawi. March 2015.

Paul D Stewart / Sectioned fossil ammonite where the shell material has been replaced by pyrites, and the empty cavities of the shell have filled during fossilisation with crystalised yellow/green calcite preserving d...

Chris Gomersall / Carcass of cow with scavenging Thick billed crows (Corvus macrorhynchos) and feral dog. Haryana, India. March 2005. The population crash of wild vultures in the Indian subcontinent has caused concerns...

Paul Harcourt Davies / Early Spider (Ophrys sphegodes) aberrant flowers with no lip - replaced by sepals. Piediluco, Terni, Umbria, Italy, May.

Paul Harcourt Davies / Bee Orchid (Ophrys apifera) aberrant form lacking a lip which has been replaced by one of the lateral petals (semipeloric form) near Orvieto, Umbria, Italy, June.

Cyril Ruoso / Common Eider (Somateria mollissima) down is replaced by hay during down collection on Aedey Island, Iceland

Stephen Dalton / Experimental wildflower border in which the top 6cm of top soil removed and replaced with sharpsand, England, UK, May 2012. Sequence image 1/2

Stephen Dalton / Experimental wildflower border in bloom, in which the top 6cm of top soil was removed and replaced with sharpsand, England, UK, May 2012. Sequence image 2/2.

Toby Roxburgh / Oldbury Power Station station, which is currently being decomissioned by the operator Magnox North Ltd and is likely to be replaced by a new larger one to be operated by E.ON and RWE npower, England,...

Mark Moffett / Gum Tree (Eucalyptus sp) stacked lumber cut from plantations of this non-native species which have replaced 7.5 million acres of forest in Brazil, the world's biggest source of Eucalyptus pulp for pap...

Cyril Ruoso / Common Eider (Somateria mollissima) down is replaced by hay during down collection, Aedey Island, Iceland

Paul D Stewart / Illustrations of chimpanzee (Pan troglodytes) 'Tommy'. Caption reads, 'Chimpanzee or African Orang-Utan, Zoological Gardens, Regent's Park'. Mezzotint engraving with hand tinting, by George Scharf, p...

Paul D Stewart / Portrait of George Cuvier, naturalist, comparative anatomist and palaeontologist (23 August 1769 - 13 May 1832). Portrait engraving by James Thompson, issued by Mackenzie Glasgow around 1833 with late...

Onne van der Wal / The crew of the Open 60 "Artemis Ocean Racing", from second left, Ian McCabe, Miranda Merron, Jonny Malbon, Brian Thompson. Thompson has now been replaced by Malbon.

Onne van der Wal / The crew of the Open 60 "Artemis Ocean Racing", from second left, Ian McCabe, Miranda Merron, Jonny Malbon, Brian Thompson. Thompson has now been replaced by Malbon.

Roberto Rinaldi / Beef Island with Tortola Island behind it. British Virgin Islands, BVI. ^^^The two islands are connected by the Queen Elizabeth II bridge that was originally opened in 1967 and replaced and re-opened...

John Cancalosi / ScScheelite crystal [CaWO4] (below) on Muscovite, from China. Scheelite is calcium tungstate usually with some of the tunsten replaced by molybdenum, it is fluorescent and an important ore of tungsten...

John Cancalosi / Scheelite crystal [CaWO4] (below) on Muscovite, from China. Scheelite is calcium tungstate usually with some of the tunsten replaced by molybdenum, it is fluorescent and an important ore of tungsten,...

Nigel Cattlin / Loose wheat smut (Ustilago nuda f.sp. tritici) on Wheat (Triticum aestivum) ears where fungal smut has replaced the grain in awned ears of wheat, Germany. May.

Nigel Cattlin / Loose wheat smut (Ustilago nuda f.sp. tritici) on Wheat (Triticum aestivum) ears where fungal smut has replaced the grain in awned ears of wheat, Germany. May.

Nigel Cattlin / Ears of unripe Barley (Hordeum vulgare) infected with Loose smut (Ustilago nuda) where black fungal smut has replaced the grain. May.

Doug Gimesy / An anaesthetised male Koala (Phascolarctos cinereus) recovers from having his IV catheter replaced and his health checked after previous surgery for severe peritonitis (believed to be the result of a...

Jack Dykinga / Aerial view of Border wall resulting in habitat fragmentation between Arizona and Sonora, Mexico. The 10 foot high wallis being replaced by a 30 foot barrier. Organ Pipe Cactus National Monument, Ariz...

Nigel Cattlin / Bunt or covered smut (Tilletia tritici) infected ripe wheat ear with bunt balls cut open to show spores replacing grain.

Nigel Cattlin / Loose smut (Ustilago nuda) varying degrees of fungal disease infection on smutted ears of barley

Nigel Cattlin / Ergot (Claviceps purpurea) ergots replacing grains in a ripening wheat ear