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.

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 cow, North Senegal, West Africa

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

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.

LYNN M. STONE / Domestic cow {Bos taurus} sniffing camera, milking shorthorn breed, USA

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

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

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

Ashley Cooper / Dairy cow with a full udder

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.

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

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

Ingo Arndt / Ants (Formicidae) milking Aphids on plant stem, Germany

Ingo Arndt / Ants (Formicidae) milking Aphid on plant stem, Germany

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 / Fresian-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.

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

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.

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

Pascal Tordeux / Farmer milking Abondance cows, the milk is used in the production of Beaufort cheese. Beaufort district, near Bourg-Saint-Maurice, Rhone-Alpes, France, May 2014.

Pascal Tordeux / Farmer milking Abondance cow, the milk is used in the production of Beaufort cheese. Beaufort district, near Bourg-Saint-Maurice, Rhone-Alpes, France, May 2014.

Pascal Tordeux / Farmer sitting with dog, milking Abondance cows. The milk is used in the production of Beaufort cheese. Beaufort district, near Bourg-Saint-Maurice, Rhone-Alpes, France, May 2014.

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

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

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

Pal Hermansen / Farmers milking cows, Riga, Latvia, May 2002.

Doug Wechsler / Ants milking Aphids (Aphis corepsidis) and Ladybug larva (Scymninae) on Beggar-ticks (Bidens frondosa) Lardner's Point Park, Philadelphia, Pennsylvania, USA, August.

Will Watson / Shepherd boys herding Goats (Capra hircus) into pen for milking, Carpathian Mountains, Ukraine, July 2013.

Will Watson / Shepherd boys milking Goats (Capra hircus) in the Carpathian Mountains, Transcarpathia, Ukraine, July 2013.

Will Watson / Shepherd boys milking Goats (Capra hircus) in the Carpathian Mountains, Transcarpathia, Ukraine, July 2013.

Will Watson / Shepherd herding Goats (Capra hircus) into pen for milking, Carpathian Mountains, Ukraine, July 2013.

Will Watson / Shepherd boys milking goats (Capra hircus) in the Carpathian Mountains, Transcarpathia, Ukraine, July 2013.

Lynn M Stone / Owner milking an Oberhasli dairy nanny goat on a portable aluminum milking stand, East Troy, Wisconsin, USA

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

Roland Seitre / Coastal Taipan (Oxyuranus scutellatus) being milked for antivenom, Australian Reptile Park, New South Wales, Australia

Ben Lascelles / Goat herder rounding up 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

Ben Lascelles / Women goat herders rounding up goats for milking. Nomadic herders are known as Drokpa and make up about 25 percent of Tibetans in Tibet. Near Baryang, Tibet. June 2010

Ben Lascelles / Goat herder milking, a nomadic herder known as Drokpa, who make up about 25 percent of Tibetans in Tibet. Near Baryang, Tibet. June 2010

Ben Lascelles / Goats bound together for milking, they belong to nomadic herders known as Drokpa, who make up about 25 percent of Tibetans in Tibet. Near Baryang, Tibet. June 2010

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

Will Watson / Holstein cows taking themselves to milking parlour, passing fishing pool, Herefordshire, UK

Cheryl-Samantha Owen / An orma woman milks a cow, part of pastoralist tribe living in Tana River delta, Kenya, East Africa 2010

Daniel Heuclin / Extracting venom from Gaboon Viper (Bitis gabonica rhinoceros) for the production of antivenom. Ghana, Africa.

Roland Seitre / Milking a Sydney Funnel Web Spider (Atrax robustus); the venom will be used in medical research and for making anti-venom. Australian Reptile Park, Gosford, New South Wales.

Roland Seitre / Milking a Sydney Funnel Web Spider (Atrax robustus); the venom will be used in medical research and for making anti-venom. Australian Reptile Park, Gosford, New South Wales.

Roland Seitre / Snake handler labeling venom-milking glass, used in medical research and for making anti-venom. Australian Reptile Park, Gosford, New South Wales.

Roland Seitre / Death Adder (Acanthophis antarcticus) being milked. Venom is extracted from the snake for medical and research purposes. Australian Reptile Park, Gosford, New South Wales.

Roland Seitre / Death Adder (Acanthophis antarcticus) being prepared for milking. Venom will be extracted from the snake for medical and research purposes. Australian Reptile Park, Gosford, New South Wales.

Roland Seitre / Taipan (Oxyuranus scutellatus) about to be milked; venom is extracted for study and to make anti-venom. Australian Reptile Park, Gosford, New South Wales.

Roland Seitre / Taipan (Oxyuranus scutellatus) being milked; venom is extracted for study and to make anti-venom. Australian Reptile Park, Gosford, New South Wales.

Roland Seitre / Taipan (Oxyuranus scutellatus) about to be milked; venom is extracted for study and to make anti-venom. Australian Reptile Park, Gosford, New South Wales.

Jeff Rotman / Milking a tiny but deadly Saw scaled viper (Echis carinatu) for anti-venom, Taramani, Tamil Nadu, India

Jeff Rotman / Milking a tiny but deadly Saw scaled viper (Echis carinatu) for anti-venom, Taramani, Tamil Nadu, India

Ernie Janes / Domestic cattle, Jersey dairy herd gather for afternoon milking, UK, June 2005

Bryan and Cherry Alexander / Herder milking Yak outside a stone shelter. Nimaling Plateau, Ladakh, India, 1986.

ASHISH & SHANTHI CHANDOLA / Maldhari man milking his cattle (Bos indicus), Kutch, Gujarat, India, April 2009

ASHISH & SHANTHI CHANDOLA / Maldhari man milking his cow (Bos indicus) while the calf suckles, Kutch, Gujarat, India, April 2009

ASHISH & SHANTHI CHANDOLA / Jat boy milking a Dromedary camel (Camelus dromedarius) while its young suckles, Kutch, Gujarat, India, December 2009

Bryan and Cherry Alexander / Girl and grandmother milking Reindeer / Caribou (Rangifer tarandus) at herders' camp. Todzhu, Tuva, Siberia, Russia, 1998.

Bryan and Cherry Alexander / Woman milking Moose (Alces alces) at Sumarokova Moose Farm. Kostroma, Russia, 2002.

Bryan and Cherry Alexander / Woman milking Moose (Alces alces) at Sumarakova Moose Farm. Kostroma, Russia, 2002.

LYNN M. STONE / Roan Milking Shorthorn cow grazing in lush, spring pasture; South Randolph, Vermont, USA

LYNN M. STONE / Roan-coloured Milking Shorthorn cow in springtime pasture; Bradford, Vermont, USA

Bryan and Cherry Alexander / Sami Pahkakuppi, birch wood bowl with decorated handle, used for milking Reindeer, Finland.

Murray Cooper / Treehopper (Membracidae) nymphs milked by butterfly caterpillar, Ecuador

David Woodfall / Dairy cattle being taken home for milking, Bangladesh, November 2008

David Woodfall / Dairy cattle being taken home for milking, Bangladesh, November 2008

LYNN M. STONE / Domestic goat {Capra hircus} Alpine dairy breed female goat in field, East Troy, Wisconsin, USA

Jean E. Roche / Lacaune sheep being milked for production of Roquefort cheese, Aveyron, France

Jean E. Roche / Lacaune sheep being milked for production of Roquefort cheese, Aveyron, France

Jean E. Roche / Lacaune sheep being milked for production of Roquefort cheese, Aveyron, France

Jean E. Roche / Lacaune sheep being milked for production of Roquefort cheese, Aveyron, France