Black grouses court on a mating ground in a field near the village of Lovtsevichi, Belarus April 23, 2020. REUTERS/Vasily Fedosenko 

A black grouse lands on a mating ground in a field near the village of Lovtsevichi, Belarus April 23, 2020. REUTERS/Vasily Fedosenko 

A black grouse flies above a mating ground in a field near the village of Lovtsevichi, Belarus April 23, 2020. REUTERS/Vasily Fedosenko 

A truck pours sand on stagnant water pools to drain the potential breeding sites of Aedes aegypti mosquitoes, known to spread the dengue fever, in Hodeidah, Yemen January 20, 2020. Picture taken January 20, 2020. REUTERS/Abduljabbar Zeyad 

Insects breeding are pictured on stagnant water pools which could server as potential breeding sites of Aedes aegypti mosquitoes, known to spread the dengue fever, in Hodeidah, Yemen January 20, 2020. Picture taken January 20, 2020. REUTERS/Abduljabbar Zeyad 

A male lion stands over a female after mating in the Maasai Mara National Reserve, Kenya, October 14, 2019. Picture taken October 14, 2019. REUTERS/Baz Ratner 

Lions mate in the Maasai Mara National Reserve, Kenya, October 14, 2019. Picture taken October 14, 2019. REUTERS/Baz Ratner 

Two Aldabra giant tortoises mate at the La Vanille Nature Park in Riviere des Anguilles, Mauritius, August 19, 2019. REUTERS/Benoit Tessier 

A cow drinks water on a field near Frankenberg, Germany, August 7, 2018. REUTERS/Ralph Orlowski 

A peacock displays his plumage as part of a courtship ritual to attract a mate during a sunny day at the Hellabrunn zoo in Munich, Germany, May 18, 2018. REUTERS/Michael Dalder 

A peacock displays his plumage as part of a courtship ritual to attract a mate during a sunny day at the Hellabrunn zoo in Munich, Germany, May 18, 2018. REUTERS/Michael Dalder 

A peacock displays his plumage as part of a courtship ritual to attract a mate during a sunny day at the Hellabrunn zoo in Munich, Germany, May 18, 2018. REUTERS/Michael Dalder 

A peacock displays his plumage as part of a courtship ritual to attract a mate during a sunny day at the Hellabrunn zoo in Munich, Germany, May 18, 2018. REUTERS/Michael Dalder 

A cow grazes in a farm near Ceres, Argentina, April 9, 2018. REUTERS/Marcos Brindicci 

Cows graze in a farm near Ceres, Argentina, April 9, 2018. REUTERS/Marcos Brindicci 

Cows graze on a farm near Sunchales, Argentina, April 6, 2018. Picture taken April 6, 2018. REUTERS/Marcos Brindicci 

Cows graze on a farm near Sunchales, Argentina, April 6, 2018. Picture taken April 6, 2018. REUTERS/Marcos Brindicci 

Cows graze on a farm near Santiago del Estero, Argentina, April 6, 2018. Picture taken April 6, 2018. REUTERS/Marcos Brindicci 

Cows graze on a farm near Sunchales, Argentina, April 6, 2018. Picture taken April 6, 2018. REUTERS/Marcos Brindicci 

A rooster receives a blessing from a priest on the day of Saint Anthony, the patron saint of domestic animals, in Xochimilco in Mexico City, Mexico, Mexico January 17, 2018. REUTERS/Carlos Jasso 

Long-tailed mayflies (Palingenia longicauda) mate on the surface of the Tisza river near Tiszakurt, Hungary, June 14, 2016. Millions of these short-lived mayflies engage in a frantic rush to mate and reproduce before they perish in just a few hours during "Tiszaviragzas" or Tisza blooming season from late spring to early summer every year. REUTERS/Laszlo Balogh TPX IMAGES OF THE DAY

Long-tailed mayflies (Palingenia longicauda) mate on the surface of the Tisza river near Tiszakurt, Hungary, June 14, 2016. Millions of these short-lived mayflies engage in a frantic rush to mate and reproduce before they perish in just a few hours during "Tiszaviragzas" or Tisza blooming season from late spring to early summer every year. REUTERS/Laszlo Balogh 

Long-tailed mayflies (Palingenia longicauda) mate on the surface of the Tisza river near Tiszakurt, Hungary, June 14, 2016. Millions of these short-lived mayflies engage in a frantic rush to mate and reproduce before they perish in just a few hours during "Tiszaviragzas" or Tisza blooming season from late spring to early summer every year. REUTERS/Laszlo Balogh 

Long-tailed mayflies (Palingenia longicauda) mate on the surface of the Tisza river near Tiszakurt, Hungary, June 14, 2016. Millions of these short-lived mayflies engage in a frantic rush to mate and reproduce before they perish in just a few hours during "Tiszaviragzas" or Tisza blooming season from late spring to early summer every year. REUTERS/Laszlo Balogh 

Long-tailed mayflies (Palingenia longicauda) mate on the surface of the Tisza river near Tiszakurt, Hungary, June 14, 2016. Millions of these short-lived mayflies engage in a frantic rush to mate and reproduce before they perish in just a few hours during "Tiszaviragzas" or Tisza blooming season from late spring to early summer every year. REUTERS/Laszlo Balogh 

Long-tailed mayflies (Palingenia longicauda) mate on the surface of the Tisza river near Tiszakurt, Hungary, June 14, 2016. Millions of these short-lived mayflies engage in a frantic rush to mate and reproduce before they perish in just a few hours during "Tiszaviragzas" or Tisza blooming season from late spring to early summer every year. REUTERS/Laszlo Balogh 

Long-tailed mayflies (Palingenia longicauda) mate on the surface of the Tisza river near Tiszakurt, Hungary, June 14, 2016. Millions of these short-lived mayflies engage in a frantic rush to mate and reproduce before they perish in just a few hours during "Tiszaviragzas" or Tisza blooming season from late spring to early summer every year. REUTERS/Laszlo Balogh 

A mating pair of crabs, or "doublers" in the local parlance, skirt the grass along the shore near the Taylors Island Wildlife Management Area in Taylors Island, Maryland August 27, 2015. A male crab attaches himself to a female when she has moulted her hard shell and is nearly ready to mate. He latches onto her for a day or two while they mate and protects her until her new shell has hardened. REUTERS/Jonathan ErnstPICTURE 13 OF 29 FOR WIDER IMAGE STORY "CRAB CATCHING BLUES"SEARCH "CRABS BLUES" FOR ALL IMAGES

Long-tailed mayflies (Palingenia longicauda) mate on the surface of the Tisza river near Tiszainoka, Hungary, June 18, 2015. Millions of these short-lived mayflies engage in a frantic rush to mate and reproduce before they perish in just a few hours during "Tiszaviragzas" or Tisza blooming season from late spring to early summer every year. REUTERS/Bernadett Szabo 

An employee looks at a boar as it walks among female pigs during the process of insemination at a new modernized pig farm owned by the Sangilen Plus agrarian holding outside Podsopki village near Russia's Siberian city of Krasnoyarsk, August 12, 2014. The farm, which is still under construction, is aimed at the breeding of 14,000 pigs a year, according to the official representative of the company. Last week Russia banned imports of fruit, vegetables, meat, poultry, fish, shellfish, scallops, milk and dairy from the United States, the European Union, Australia, Canada and Norway in retaliation for Western sanctions over the crisis in Ukraine. Picture taken August 12, 2014. REUTERS/Ilya Naymushin (RUSSIA - Tags: AGRICULTURE ANIMALS BUSINESS POLITICS FOOD) 

Stuffed copulating rabbits are displayed at the exhibition "Sex and Evolution" at the Natural History museum in the western city of Muenster October 17, 2013. The exhibition, which features animals mating and examines how sex in the plant and animal kingdoms plays the main role in evolution, runs from October 11 until October 19, 2014. REUTERS/Ina Fassbender (GERMANY - Tags: ENTERTAINMENT EDUCATION SOCIETY) 

Stuffed copulating magpies are displayed at the exhibition "Sex and Evolution" at the Natural History museum in the western city of Muenster October 17, 2013. The exhibition, which features animals mating and examines how sex in the plant and animal kingdoms plays the main role in evolution, runs from October 11 until October 19, 2014. REUTERS/Ina Fassbender (GERMANY - Tags: ENTERTAINMENT EDUCATION SOCIETY) 

Stuffed copulating tortoises are displayed at the exhibition "Sex and Evolution" at the Natural History museum in the western city of Muenster October 17, 2013. The exhibition, which features animals mating and examines how sex in the plant and animal kingdoms plays the main role in evolution, runs from October 11 until October 19, 2014. REUTERS/Ina Fassbender (GERMANY - Tags: ENTERTAINMENT EDUCATION SOCIETY) 

Stuffed copulating deer are displayed at the exhibition "Sex and Evolution" at the Natural History museum in the western city of Muenster October 17, 2013. The exhibition, which features animals mating and examines how sex in the plant and animal kingdoms plays the main role in evolution, runs from October 11 until October 19, 2014. REUTERS/Ina Fassbender (GERMANY - Tags: ENTERTAINMENT EDUCATION SOCIETY) 

Stuffed copulating hedgehogs are displayed at the exhibition "Sex and Evolution" at the Natural History museum in the western city of Muenster October 17, 2013. The exhibition, which features animals mating and examines how sex in the plant and animal kingdoms plays the main role in evolution, runs from October 11 until October 19, 2014. REUTERS/Ina Fassbender (GERMANY - Tags: ENTERTAINMENT EDUCATION SOCIETY) 

A visitor looks at stuffed copulating hedgehogs displayed at the exhibition "Sex and Evolution" at the Natural History museum in the western city of Muenster October 17, 2013. The exhibition, which features animals mating and examines how sex in the plant and animal kingdoms plays the main role in evolution, runs from October 11 until October 19, 2014. REUTERS/Ina Fassbender (GERMANY - Tags: ENTERTAINMENT EDUCATION SOCIETY TPX IMAGES OF THE DAY) 

Stuffed copulating peacock butterflies are displayed at the exhibition "Sex and Evolution" at the Natural History museum in the western city of Muenster October 17, 2013. The exhibition, which features animals mating and examines how sex in the plant and animal kingdoms plays the main role in evolution, runs from October 11 until October 19, 2014. REUTERS/Ina Fassbender (GERMANY - Tags: ENTERTAINMENT EDUCATION SOCIETY) 

Stuffed copulating kestrels are displayed at the exhibition "Sex and Evolution" at the Natural History museum in the western city of Muenster October 17, 2013. The exhibition, which features animals mating and examines how sex in the plant and animal kingdoms plays the main role in evolution, runs from October 11 until October 19, 2014. REUTERS/Ina Fassbender (GERMANY - Tags: ENTERTAINMENT EDUCATION SOCIETY) 

Stuffed copulating red foxes are displayed at the exhibition "Sex and Evolution" at the Natural History museum in the western city of Muenster October 17, 2013. The exhibition, which features animals mating and examines how sex in the plant and animal kingdoms plays the main role in evolution, runs from October 11 until October 19, 2014. REUTERS/Ina Fassbender (GERMANY - Tags: ENTERTAINMENT EDUCATION SOCIETY TPX IMAGES OF THE DAY) 

Stuffed copulating polecats are displayed at the exhibition "Sex and Evolution" at the Natural History museum in the western city of Muenster October 17, 2013. The exhibition, which features animals mating and examines how sex in the plant and animal kingdoms plays the main role in evolution, runs from October 11 until October 19, 2014. REUTERS/Ina Fassbender (GERMANY - Tags: ENTERTAINMENT EDUCATION SOCIETY) 

A mock copulating couple is displayed at the exhibition "Sex and Evolution" at the Natural History museum in the western city of Muenster October 17, 2013. The exhibiton, which features animals mating and examines how sex in the plant and animal kingdoms plays the main role in evolution, runs from October 11 until October 19, 2014. REUTERS/Ina Fassbender (GERMANY - Tags: SOCIETY) EDUCATION ENTERTAINMENT) 

A visitor takes a picture of copulating deer at the exhibition "Sex and Evolution" at the Natural History museum in the western city of Muenster October 17, 2013. The exhibiton, which features animals mating and examines how sex in the plant and animal kingdoms plays the main role in evolution, runs from October 11 until October 19, 2014. REUTERS/Ina Fassbender (GERMANY - Tags: SOCIETY EDUCATION ENTERTAINMENT) 

Puff adders mate in Nairobi national park September 15, 2013. The puff adder is one of the deadliest snakes in Africa. REUTERS/Goran Tomasevic (KENYA - Tags: ANIMALS TRAVEL) 

Long-tailed mayflies (Palingenia longicauda) mate on the surface of the Tisza river near Tiszainoka, 135km (84 miles) southeast of Budapest, June 23, 2013. Millions of these short-lived mayflies engage in a frantic rush to mate and reproduce before they perish in just a few hours during "Tiszaviragzas" or Tisza blooming season from late spring to early summer every year. REUTERS/Laszlo Balogh (HUNGARY - Tags: ENVIRONMENT ANIMALS SOCIETY) 

Long-tailed mayflies (Palingenia longicauda) mate on the surface of the Tisza river near Tiszainoka, 135km (84 miles) southeast of Budapest, June 23, 2013. Millions of these short-lived mayflies engage in a frantic rush to mate and reproduce before they perish in just a few hours during "Tiszaviragzas" or Tisza blooming season from late spring to early summer every year. REUTERS/Laszlo Balogh (HUNGARY - Tags: ENVIRONMENT ANIMALS SOCIETY) 

Austrian bull keeper Johannes looks at Wille, a breeding bull, at an artificial insemination centre in the village of Hohenzell, Upper Austria April 9, 2013. The centre exports cattle semen to more than 52 countries worldwide. Picture taken April 9, 2013. REUTERS/Leonhard Foeger (AUSTRIA - Tags: ANIMALS AGRICULTURE BUSINESS)

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Baboons mate at Tanzania's Serengeti National Park August 19, 2012. REUTERS/Noor Khamis (TANZANIA - Tags: ANIMALS ENVIRONMENT TRAVEL) 

Long-tailed mayflies (Palingenia longicauda) mate on the surface of the Tisza river near Tiszainoka, 135km (84 miles) southeast of Budapest, June 20, 2012. Millions of these short-lived mayflies engage in a frantic rush to mate and reproduce before they perish in just a few hours during "Tiszaviragzas" or Tisza blooming season from late spring to early summer every year. REUTERS/Laszlo Balogh (HUNGARY - Tags: ENVIRONMENT ANIMALS SOCIETY TPX IMAGES OF THE DAY) 

A frog attempts to mate with female frogs in a pond in Tourrettes, southern France, May 27, 2012. REUTERS/Ina Fassbender (FRANCE - Tags: ANIMALS) 

Silkworm butterflies copulate inside a box in Madrid May 5, 2012. REUTERS/Andrea Comas (SPAIN - Tags: ANIMALS) 

Silkworm butterflies copulate inside a box in Madrid May 5, 2012. REUTERS/Andrea Comas (SPAIN - Tags: ANIMALS) 

The Church of Pokrov on Nerli is reflected in a pool of floodwater as frogs mate in the water in the village of Bogolyubovo, some 190 km (118 miles) east of Moscow April 26, 2012. REUTERS/Denis Sinyakov (RUSSIA - Tags: SOCIETY RELIGION ANIMALS ENVIRONMENT TPX IMAGES OF THE DAY) 

Syntomoides imaon moths mate on the stem of a plant in Lalitpur October 11, 2011. REUTERS/Navesh Chitrakar (NEPAL - Tags: ANIMALS ENVIRONMENT) 

Indigenous men from TIPNIS look at goats in La Embocada town, some 25 km off Yucumo September 15, 2011. The Amazonian ethnic groups which live in the Isiboro Secure territory, known by its Spanish acronym TIPNIS, are completing a 370-mile (595-km) march from Trinidad, in the northern Beni province, to La Paz to protest against a projected 185-mile (298-km) long highway that bisects the protected park in the Amazon forest, activists leading the march said. The protesters, who have a list of demands apart from their rejection of the highway project being financed by Brazil, are entering a rural region with strong sentiments for President Evo Morales, raising the possibility of confrontations on their way to La Paz. REUTERS/David Mercado (BOLIVIA - Tags: CIVIL UNREST POLITICS ENVIRONMENT ANIMALS) 

Two Aldabra giant tortoises mate at the Artis Zoo in Amsterdam August 10, 2011. REUTERS/Michael Kooren (NETHERLANDS - Tags: ANIMALS SOCIETY IMAGES OF THE DAY) 

Two Aldabra giant tortoises mate at the Artis Zoo in Amsterdam August 10, 2011. REUTERS/Michael Kooren (NETHERLANDS - Tags: ANIMALS SOCIETY IMAGES OF THE DAY) 

Roxy, a Rottweiler-Labrador cross formerly from the Battersea dog'shome shelter, sits in the judging enclosure before winning the "Best Dressed Victorian on Six Legs" category during the Dashing Dog Show at Kensington Palace in London June 18, 2011. REUTERS/Luke MacGregor (BRITAIN - Tags: ENTERTAINMENT SOCIETY ANIMALS) 

Long-tailed mayflies (Palingenia longicauda) mate on the surface of the Tisza river near Tiszakurt, 135km (84 miles) southeast of Budapest, June 12, 2011. Millions of these short-lived mayflies engage in a frantic rush to mate and reproduce before they perish in just a few hours during "Tiszaviragzas" or Tisza blooming season from late spring to early summer every year. REUTERS/Laszlo Balogh (HUNGARY - Tags: ENVIRONMENT ANIMALS SOCIETY) 

Long-tailed mayflies (Palingenia longicauda) mate on the surface of the Tisza river near Tiszakurt, 135km (84 miles) southeast of Budapest, June 12, 2011. Millions of these short-lived mayflies engage in a frantic rush to mate and reproduce before they perish in just a few hours during "Tiszaviragzas" or Tisza blooming season from late spring to early summer every year. REUTERS/Laszlo Balogh (HUNGARY - Tags: ENVIRONMENT ANIMALS SOCIETY)