Ashley Cooper / Woman with solar cooker used to cook food for the school students at Muni Seva Ashram, Goraj, near Vadodara, India. December.

Nick Upton / Northern shoveler (Anas clypeata) large group feeding co-operatively in a shallow lake by cricling in a dense raft, believed to stir up organic sediments for them to filter feed on, Gloucestershire, U...

Nick Upton / Slow motion clip of a Little egret (Egretta garzetta) hunting in the shallows of a large lake, trying to stir up fish with its feet, Rutland Water, Rutland, England, UK, November.

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...

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.

Norbert Wu / Caribbean Reef Shark (Carcharhinus perezii) group stir up sand in a feeding frenzy, not dangerous to divers, Bahamas

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.

Shane Gross / Scientists from The Nature Conservancy using their bodies to stir Eelgrass (Zostera marina) in large tanks where seeds will separate from leaves for later dispersal. Part of the largest seagrass bed r...