Juan Carlos Munoz / Cheese maturing on shelves in traditional dairy, Triglav National Park, Slovenia, October 2014.

Juan Carlos Munoz / Cheesemaker holding a hard cheese, with equipment in the background. Triglav National Park, Slovenia, October 2014.

Ben Lascelles / Goat herder binding goats for milking, these nomadic herders are known as Drokpa and make up about 25 percent of Tibetans in Tibet. Near Baryang, Tibet. June 2010.

Ammonite / Black garden ant (Lasius niger) carrying off a dead aphid and milking others for honeydew, Bristol, England, UK, July.

Ammonite / Black garden ant (Lasius niger) milking aphids for honeydew, Bristol, England, UK, July.

Lynn M Stone / Domestic cow {Bos taurus} sniffing camera, milking shorthorn breed, USA

Laurent Geslin / Fulani woman milking cow, North Senegal, West Africa

Laurent Geslin / Fulani woman feeding milk to her child at dawn after milking the cattle, North Senegal, West Africa, 2005

Laurent Geslin / Fulani woman milking cattle, North Senegal, West Africa, 2005

Tony Phelps / Extracting venom from Puff adder {Bitis arietans} at Liverpool school of tropical medicine, UK

Jabruson / Milking venom from Spectacled cobra {Naja naja kaouthia} Bangkok, Thailand. Used for anti-venom production. Snake bites onto glass plate and ejects venom.

Rolf Nussbaumer / Acrobat ant (Crematogaster sp) milking aphid. Hill Country, Texas, USA.

Francisco Marquez / Man milking goat, Extremadura, Spain. The Mediterranean forest is the grazing area for these animals, where they find food and shelter.

Daniel Heuclin / Milking venom from Feathertail centipede (Alipes sp) Togo.

Daniel Heuclin / Milking venom from Feathertail centipede (Alipes sp) Togo.

Sylvain Cordier / Capybara (Hydrochaeris hydrochaeris) female with two young suckling, Pantanal, Mato Grosso, Brazil.

Matthew Maran / Dairy cows on organic farm feeding on pellets during milking, East Devon, England, UK, July.

Ashley Cooper / Milking sheep on a farm in Lazonby, Cumbria, England, UK, August.

Ashley Cooper / Dairy cow with a full udder

Orsolya Haarberg / Flock of sheep gathered in a fenced area before milking. Noscolat (Naskalat), Ghimes, Ciucului Mountains, Transylvania, Romania. October 2011.

Mark Taylor / Kyrgyz woman making cream. Kyrgyzstan. August 2016.

Mark Taylor / Boy milking a horse in rain, Kyrgyzstan. July 2016.

Erlend Haarberg / Sarig Attila milking his cow in AldomAspataka (Ghimes). Ciucului mountains, Transylvania, Romania.

Erlend Haarberg / Shepherds Szakacs Pal and Antal Jeno hand milking goats on Mount Noscolat (Naskalat). Ghimes, Ciucului Mountains, Transylvania, Romania.

Will Watson / Holstein Cows on water bed in modern automated milking parlour, Herefordshire, England.

Will Watson / Holstein Cow attached to automated milking machine, Herefordshire, England, UK, February.

Will Watson / Holstein Cow attached to automated milking machine, Herefordshire, England, UK, February.

Will Watson / Holstein Cows feeding in modern automated milking parlour, farmer, Herefordshire, England.

Will Watson / Holstein Cow in modern automated milking parlour, farmer, Herefordshire, England.

Paul D Stewart / Tribesman from Northern India milking a Dromedary camel (Camelus dromedarius) while juvenile stimulates milk production by nuzzling. Juvenile camels are a reservoir for middle east respiratory syndrom...

Suzi Eszterhas / Domestic goats (Capra hircus) in milking parlour, Sonoma County, California, USA, May 2012.

Suzi Eszterhas / Domestic goats (Capra hircus) in milking parlour, Sonoma County, California, USA, May 2012.

Eric Baccega / Himba girl with traditional double plait hairstyle, milking goat. Marienfluss Valley, Kaokoland Desert, Namibia. October 2015

Eric Baccega / Himba girl with traditional double plait hairstyle milking a goat. Marienfluss Valley, Kaokoland Desert, Namibia. October 2015

Brent Stephenson / Friesian-Jersey cross cows (Bos taurus) in dairy parlour with man, Ashley Clinton, Hawkes Bay, New Zealand, September 2011, Model released.

Brent Stephenson / Friesian-Jersey cross cows (Bos taurus) in milking parlour, Ashley Clinton, Hawkes Bay, New Zealand, September.

Brent Stephenson / Dairy farmer washing down the dairy shed after milking, Ashley Clinton, Hawkes Bay, New Zealand, September, Model released.

Daniel Heuclin / Milking venom from Banded sea krait (Laticauda colubrina)

Daniel Heuclin / Man milking venom from Green pit viper (Trimeresurus albolabris)

Daniel Heuclin / Stone-fish (Synanceia verrucosa) venom milking.

Klein & Hubert / Herd of Tarine cows grazing along a creek in alpine meadow, with mobile milking unit in the background, French Alps, France.

Kirkendall-Spring / Woman milking a yak at a herders camp, near Soi Yaksa Valley along the Jhomolhari Trek. Bhutan, October 2014.

Chris Mattison / White milking bonnet (Mycena galopus var. candida) Peak District, Derbyshire, UK, October. Image taken using digital focus-stacking.

Rob Cousins / Waterbuffalo (Bubalus bubalis) in the milking parlour, Laverstoke Park Farm, Hampshire, UK, September 2010.

Rob Cousins / Waterbuffalo (Bubalus bubalis) in the milking parlour, Laverstoke Park Farm, Hampshire, UK, September 2010.

Rob Cousins / Waterbuffalo (Bubalus bubalis) in the milking parlour, Laverstoke Park Farm, Hampshire, UK, September 2010.

Rob Cousins / Waterbuffalo (Bubalus bubalis) in the milking parlour, Laverstoke Park Farm, Hampshire, UK, September 2010.

Rob Cousins / Waterbuffalo (Bubalus bubalis) in the milking parlour, Laverstoke Park Farm, Hampshire, UK, September 2010.