Alex Hyde / Close up of feathers of cock Pheasant (Phasianus colchicus).

Luis Quinta / Abstract image of large sea swells hitting the rocks, Portuguese southwestern coast, Portugal, March, 2010.

Alex Mustard / Underwater scene where light and water interplay on a shallow sand bank, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea, September 2005.

Chris Gomersall / 2020VISION / Hexagonal basalt columns on the island of Staffa, Treshnish Isles, Inner Hebrides, Scotland, UK, June

Alex Mustard / Grooved brain coral (Diploria labyrinthiformis) close up view, East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Edwin Giesbers / Grevy zebra (Equus grevyi) close up of stripes, captive

Edwin Giesbers / Reticulated giraffe (Giraffa camelopardalis reticulata) close up of skin pattern, captive

Claudio Contreras / Detail of Ocellated Turkey (Meleagris / Agriocharis ocellata) plumage. El Mirador-Rio Azul National Park, Department of Peten, Guatemala.

Paul D Stewart / Detail of Great Argus Pheasant (Argusianus argus) zoo specimen, from SE Asia. Secondary wing feathers showing ocelli. Page 143 Vol II of Charles Darwin 'The Descent of Man and Selection in Relation to...

Ross Hoddinott / 2020VISION / Ice pattern, Merrivale, Dartmoor National Park, Devon, England, UK, February. Did you know? Hot water freezes more quickly than cold, although it is not known why.

Franco Banfi / Detail of sponge (Chalinula nematifera) Maldives, Indian Ocean

Franco Banfi / Close up detail of soft coral (Dendronephthya sp.) Maldives, Indian Ocean