Solvin Zankl / Bioluminescent Sea-fireflies (Vargula hilgendorfii) producing a bright blue light. The light is produced by mixing two chemicals together in the presence of oxygen and is for mating displays or defenc...

Martin Gabriel / Arenal Volcano at sunset, clouds mixing with smoke, Costa Rica, February 2009

Juergen Freund / Volunteer mixing eggs and sperm of pink salmon. Canada (Oncorhynchus gorbuscha)

Juergen Freund / Volunteers mixing eggs and sperm from salmon in hatchery, Canada

David Pattyn / Black Vulture (Coragyps atratus) and a Tukey Vulture (Cathartes aura) eating from a dead fish washed up the beach, Puerto Lopez , Santa Elena Peninsula, Manabi Province, Ecuador, July

David Fleetham / Auger shell (Terebridae) eye to eye with Skeleton shrimp (Caprellidae sp), close-up. Blurry areas in the background where freshwater is percolating up through sand and mixing with saltwater. Philippin...

David Fleetham / Skeleton shrimp (Caprellidae sp) on sea floor. Blurry areas where freshwater is percolating up through sand and mixing with saltwater. Dumaguete, Philippines

Ashley Cooper / Clear water from Dettifoss waterfall mixing with glacial meltwater of River Jokulsa a Fjollum from the Vatnajokull ice sheet. Iceland, September 2010

Solvin Zankl / Bioluminescent Sea-fireflies (Vargula hilgendorfii) producing a bright blue light. The light is produced by mixing two chemicals together in the presence of oxygen and is for mating displays or defenc...

Solvin Zankl / Bioluminescent Sea-fireflies (Vargula hilgendorfii) producing a bright blue light. The light is produced by mixing two chemicals together in the presence of oxygen and is for mating displays or defenc...

Solvin Zankl / Bioluminescent Sea-fireflies (Vargula hilgendorfii) washed up on shore, producing a bright blue light. The light is produced by mixing two chemicals together in the presence of oxygen and is for mati...

Solvin Zankl / Bioluminescent Sea-fireflies (Vargula hilgendorfii) washed up on shore, producing a bright blue light. The light is produced by mixing two chemicals together in the presence of oxygen and is for mati...

Solvin Zankl / Bioluminescent Sea-firefliy (Vargula hilgendorfii) producing a bright blue light. The light is produced by mixing two chemicals together in the presence of oxygen and is for mating displays or prey de...

Michel Roggo / Aerial view of the Danube Delta with murky water of the Danube river mixing with the clear water of the delta channels, Danube Delta Biosphere Reserve UNESCO World Heritage Site,, Romania May 2014. Ph...

Alex Hyde / Photographer heating silica gel over camp fire in rainforest to restore its desiccating properties. The high humidity of the rainforest can fog camera lenses and lead to mould growth, so silica gel is...

Eric Baccega / Himba woman mixing ochre with butter to make Otjize, Marienfluss Valley. Kaokoland, Namibia. October 2015

Eric Baccega / Himba woman mixing ochre with butter to make Otjize, Marienfluss Valley. Kaokoland, Namibia. October 2015

Cheryl-Samantha Owen / Coffee (Coffea arabica) beans roasting over a fire, Tanzania, East Africa.

Cheryl-Samantha Owen / Coffee (Coffea arabica) beans roasting over a fire, Tanzania, East Africa.

Cheryl-Samantha Owen / Man washing Coffee (Coffea arabica) beans to remove the mucilage (viscous substance) after fermentation. Commercial coffee farm, Tanzania, East Africa.

Wild Wonders of Europe / Bartocha / Mixture of ground plants including Common wood sorrel (Oxalis acetosella), Herb Robert (Geranium robertianum), Maidenhair spleenwort (Asplenium trichomanes) Sweet woodruff (Galium odoratum) Wild straw...

Lisa Hoffner / Mixing milk for the elelphants (Loxodonta africana) at David Sheldrick Wildlife Trust Nairobi Elephant Nursery, Kenya, August 2008.

Lisa Hoffner / Keeper mixing special milk formula for the orphaned elephants (Loxodonta africana). David Sheldrick Wildlife Trust Nairobi Elephant Nursery, Kenya, August 2008.

Lisa Hoffner / Mixing milk for the elephants at David Sheldrick Wildlife Trust Nairobi Elephant Nursery, Kenya, August 2008.

Ross Hoddinott / 2020VISION / Fly Agaric fungus {Amanita muscaria} in autumn, Beacon Hill Country Park, The National Forest, Leicestershire, UK. November. Did you know? Fly agaric is so called as it was historically used as an ins...

Dave Bevan / Gardener filling a compost bin, mixing the material by moving from bin to bin, UK, model released

Pete Oxford / Rajasthani man mixing ingredients for Indian sweets. Jaisalmer, Rajasthan, India

Igor Shpilenok / Pools of water coloured by the mixing of chemicals, algae, and bacteria. Valley of the Geysers, Kronotsky Zapovednik Reserve, Russia.

Pete Oxford / Machiguenga Indian mixing manioc for local brew. Timpia Community, Lower Urubamba River, Amazon rainforest, Peru. South America

Jiri Lochman / Potter wasp (Delta latreillei) female, collecting soil from freshly built section of a termite mound and mixing it with the water, the wet muddy soil will be used to build the mud nest, Durba Hills, L...

Robin Chittenden / Six Northern eider (Somateria mollissima) and ten Eurasian wigeon (Anas penelope) flock in flight over sea, Cley, Norfolk, UK. November.

Robin Chittenden / Red-breasted goose (Branta ruficollis) and three Brent geese (Branta bernicla) standing in grass with two hissing, Cley, Norfolk, UK. February.

Jack Dykinga / Black-necked stilt (Himantopus mexicanus) foraging in shallows, stirring water as it goes. Gilbert Riparian Preserve, Arizona, USA.

Jack Dykinga / Black-necked stilts (Himantopus mexicanus) searching for food by stirring the shallows with its bill as it wades through the water.Gilbert, Riparian Preserve, Arizona, USA.

Jack Dykinga / Black-necked stilt (Himantopus mexicanus) foraging in shallows stirring water as it goes. Gilbert Riparian Preserve, Arizona, USA.

Philippe Clement / South face of the mountain Drei Zinnen / Tre Cime di Lavaredo and larch trees in the Tre Cime Natural Park in autumn, Dolomites, South Tyrol, Italy, October

Philippe Clement / Mountain Drei Zinnen and larch trees reflected in water of Lake Lago d'Antorno in the Tre Cime Natural Park in autumn, Dolomites, South Tyrol, Italy, October

Philippe Clement / Mountain Drei Zinnen and larch trees reflected in water of Lake Lago d'Antorno in the Tre Cime Natural Park in autumn, Dolomites, South Tyrol, Italy, October