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.

Yva Momatiuk & John Eastcott / Wood Stork (Mycteria americana) standing in low tide, stirs up prey with one foot, Merritt Island National Wildlife Refuge, Florida

Yva Momatiuk & John Eastcott / Wood Stork (Mycteria americana) standing in low tide, stirs up prey with one foot, Merritt Island National Wildlife Refuge, Florida

Yva Momatiuk & John Eastcott / Wood Stork (Mycteria americana) standing in low tide, stirs up prey with one foot, Merritt Island National Wildlife Refuge, Florida

Constantinos Petrinos / Titan triggerfish hunting {Balistoides viridescens} - stirs up sand by blasting stream of water at seabed to expose prey. Lembeh Strait, North Sulawesi Indonesia

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.

Bryan and Cherry Alexander / Valya Serotetto, a Nenets girl, stirs a pot of reindeer stew over an open fire in a tent. Yamal. Siberia. Russia.1993.