A pupae dispensing system counts and dispense Wolbachia-Aedes aegypti pupae at the National Environmental Agency's mosquito production facility in Singapore August 19, 2020. Picture taken August 19, 2020. REUTERS/Edgar Su

Male and female Wolbachia-Aedes aegypti mosquito pupae are separated at the National Environmental Agency's mosquito production facility in Singapore August 19, 2020. Picture taken August 19, 2020. REUTERS/Edgar Su

Wolbachia-Aedes aegypti mosquito pupae are pictured at the National Environmental Agency's mosquito production facility in Singapore August 19, 2020. Picture taken August 19, 2020. REUTERS/Edgar Su

A farmer holds black soldier fly larvae in their pupae stage right before they hatch into flies in Singapore June 20, 2017. The flies eat food waste and produce fertiliser for the urban farm. Picture taken June 20, 2017. REUTERS/Thomas White

A technician from Oxitec inspects pupae of genetically modified Aedes aegypti mosquitoes at Oxitec factory in Piracicaba, Brazil, October 26, 2016. REUTERS/Paulo Whitaker

A technician from Oxitec inspects pupae of genetically modified Aedes aegypti mosquitoes at Oxitec factory in Piracicaba, Brazil, October 26, 2016. REUTERS/Paulo Whitaker

A technician from Oxitec inspects pupae of genetically modified Aedes aegypti mosquitoes at Oxitec factory in Piracicaba, Brazil, October 26, 2016. REUTERS/Paulo Whitaker

A technician from Oxitec inspects pupae of genetically modified Aedes aegypti mosquitoes at Oxitec factory in Piracicaba, Brazil, October 26, 2016. REUTERS/Paulo Whitaker

A technician from Oxitec inspects pupae of genetically modified Aedes aegypti mosquitoes at Oxitec factory in Piracicaba, Brazil, October 26, 2016. REUTERS/Paulo Whitaker

A technician from Oxitec inspects pupae of genetically modified Aedes aegypti mosquitoes at Oxitec factory in Piracicaba, Brazil, October 26, 2016 REUTERS/Paulo Whitaker TPX IMAGES OF THE DAY

Aedes aegypti mosquitoe pupas are seen at the Laboratory of Entomology and Ecology of the Dengue Branch of the U.S. Centers for Disease Control and Prevention in San Juan, March 6, 2016. Picture taken March 6, 2016. REUTERS/Alvin Baez

Aedes aegypti mosquito larvae and a pupae (top L) are seen through a stereoscopic microscope as part of a research on preventing the spread of the Zika virus and other mosquito-borne diseases at a control and prevention center in Guadalupe, neighbouring Monterrey, Mexico, March 8, 2016. REUTERS/Daniel Becerril

A technician from Oxitec inspects pupae of genetically modified Aedes aegypti mosquitoes in Campinas, Brazil, January 28, 2016. Oxitec, the UK subsidiary of U.S. synthetic biology company Intrexon, hopes to deploy a self-limiting genetically modified strain of insects to compete with normal Aedes aegypti. REUTERS/Paulo Whitaker

A technician from Oxitec inspects pupae of genetically modified Aedes aegypti mosquitoes in Campinas, Brazil, January 28, 2016. Oxitec, the UK subsidiary of U.S. synthetic biology company Intrexon, hopes to deploy a self-limiting genetically modified strain of insects to compete with normal Aedes aegypti. REUTERS/Paulo Whitaker

A technician from Oxitec inspects pupae of genetically modified Aedes aegypti mosquitoes in Campinas, Brazil, January 28, 2016. Oxitec, the UK subsidiary of U.S. synthetic biology company Intrexon, hopes to deploy a self-limiting genetically modified strain of insects to compete with normal Aedes aegypti. REUTERS/Paulo Whitaker

A technician from Oxitec inspects pupae of genetically modified Aedes aegypti mosquitoes in Campinas, Brazil, January 28, 2016. Oxitec, the UK subsidiary of U.S. synthetic biology company Intrexon, hopes to deploy a self-limiting genetically modified strain of insects to compete with normal Aedes aegypti. REUTERS/Paulo Whitaker

A technician from Oxitec inspects pupae of genetically modified Aedes aegypti mosquitoes in Campinas, Brazil, January 28, 2016. Oxitec, the UK subsidiary of U.S. synthetic biology company Intrexon, hopes to deploy a self-limiting genetically modified strain of insects to compete with normal Aedes aegypti. REUTERS/Paulo Whitaker

A technician from Oxitec inspects pupae of genetically modified Aedes aegypti mosquitoes in Campinas, Brazil, January 28, 2016. Oxitec, the UK subsidiary of U.S. synthetic biology company Intrexon, hopes to deploy a self-limiting genetically modified strain of insects to compete with normal Aedes aegypti. REUTERS/Paulo Whitaker TPX IMAGES OF THE DAY

A pupae chrysalis of a Caligo Eurilochus butterfly hangs in the studio of photographer Alexander James in London March 11, 2013. James creates still life images underwater often using butterflies, both living and dead, as part of the composition. The live butterflies are anaesthetised, and then encouraged into a state of hibernation allowing them to be photographed underwater. Photograph taken March 11, 2013. REUTERS/Luke MacGregor (BRITAIN - Tags: ENTERTAINMENT SOCIETY ENVIRONMENT ANIMALS)

A butterfly hatches from its pupa in a hatchery in Cali June 21, 2012. Alas de Colombia is a company dedicated to breeding, conservation and export of native butterflies which are used for gifts and when they die naturally are used to create accessories and crafts. Picture taken June 21, 2012. REUTERS/Jaime Saldarriaga (COLOMBIA - Tags: ANIMALS SOCIETY BUSINESS)

A woman prepares to export butterfly pupae in a hatchery in Cali June 21, 2012. Alas de Colombia is a company dedicated to the breeding, conservation and export of native butterflies which are used for gifts and, when they die naturally, are also used to create accessories and crafts. Picture taken June 21, 2012. REUTERS/Jaime Saldarriaga (COLOMBIA - Tags: BUSINESS ANIMALS SOCIETY)

A butterfly hatches from its pupa at the National museum in San Jose, February 10, 2011. The butterfly garden that has been opened to the public, displays different species from distant areas of the country. REUTERS/Juan Carlos Ulate (COSTA RICA - Tags: SOCIETY ENVIRONMENT ANIMALS)

A butterfly hatches from its pupa at the Natural History Museum in London March 31, 2010. A butterfly house will be opened to the public at the museum, housing butterflies from four continents, until September. REUTERS/Toby Melville (BRITAIN - Tags: ENVIRONMENT ANIMALS IMAGES OF THE DAY)

A visitor views butterfly pupae at the Natural History Museum in London March 31, 2010. A butterfly house will be opened to the public at the museum, housing butterflies from four continents, until September. REUTERS/Toby Melville (BRITAIN - Tags: ENVIRONMENT ANIMALS)

Laboratory assistants sort out fruit fly pupae at the International Atomic Energy Agency (IAEA) laboratories in Seibersdorf, some 50 kilometres (some 31 miles) southeast of Vienna, October 14, 2009. Scientists working for the Sterile Insect Technique (SIT) there are sterilizing fruit flies with radiation in order to decrease their populations. REUTERS/Herwig Prammer (AUSTRIA SCI TECH)

A laboratory assistant sorts out fruit fly pupae at the International Atomic Energy Agency (IAEA) laboratories in Seibersdorf, some 50 kilometres (some 31 miles) southeast of Vienna, October 14, 2009. Scientists working for the Sterile Insect Technique (SIT) there are sterilizing fruit flies with radiation in order to decrease their populations. REUTERS/Herwig Prammer (AUSTRIA SCI TECH)

A scientist displays samples of fruit fly pupae at the International Atomic Energy Agency (IAEA) laboratories in Seibersdorf, some 50 kilometres (some 31 miles) southeast of Vienna, October 14, 2009. Scientists working for the Sterile Insect Technique (SIT) there are sterilizing fruit flies with radiation in order to decrease their populations. REUTERS/Herwig Prammer (AUSTRIA SCI TECH)

A scientist sorts out fruit fly pupae at the International Atomic Energy Agency (IAEA) laboratories in Seibersdorf, some 50 kilometres (some 31 miles) southeast of Vienna, October 14, 2009. Scientists working for the Sterile Insect Technique (SIT) there are sterilizing fruit flies with radiation in order to decrease their populations. REUTERS/Herwig Prammer (AUSTRIA SCI TECH)

Holocaust survivor Pupa Garribba, of Italy, symbolically shows her hand after giving her fingerprints to join a petition, against government plans to pursue a "census" of minorities as a way of tackling crime, in downtown Rome July 7, 2008. The census would fingerprint Roma adults and children. An estimated 140,000 Roma, also known as "gypsies" and "nomads", live in Italy, many in squalid shantytowns on the fringes of cities. Picture taken July 7, 2008. To match feature EUROPE ROMA/ITALY
REUTERS/Alessandro Bianchi (ITALY)

Fried grasshoppers fried in pandan leaf are packaged for sale at a Bangkok market April 4, 2007. The ice-cream man rings a tinkling bell, the fruit man yells through a loud hailer and the insect man hoots his horn. From three-wheeled carts or shiny metal stalls, the Thai capital's insect sellers serve fried grasshoppers, water bugs, giant flies, larvae, mealworms and red ant pupae to a diverse and appreciative clientele. TO MATCH FEATURE FOOD-THAILAND/INSECTS REUTERS/Adrees Latif (THAILAND)

An insect vendor sells ant pupae to a client at a Bangkok market April 4, 2007. The ice-cream man rings a tinkling bell, the fruit man yells through a loud hailer and the insect man hoots his horn. From three-wheeled carts or shiny metal stalls, the Thai capital's insect sellers serve fried grasshoppers, water bugs, giant flies, larvae, mealworms and red ant pupae to a diverse and appreciative clientele. TO MATCH FEATURE FOOD-THAILAND/INSECTS REUTERS/Adrees Latif (THAILAND)

A woman purchases a cooked giant water beetle from a Bangkok market April 4, 2007. The ice-cream man rings a tinkling bell, the fruit man yells through a loud hailer and the insect man hoots his horn. From three-wheeled carts or shiny metal stalls, the Thai capital's insect sellers serve fried grasshoppers, water bugs, giant flies, larvae, mealworms and red ant pupae to a diverse and appreciative clientele. TO MATCH FEATURE FOOD-THAILAND/INSECTS REUTERS/Adrees Latif (THAILAND)

An insect vendor packages silkworm pupae for a client at a Bangkok market April 4, 2007. The ice-cream man rings a tinkling bell, the fruit man yells through a loud hailer and the insect man hoots his horn. From three-wheeled carts or shiny metal stalls, the Thai capital's insect sellers serve fried grasshoppers, water bugs, giant flies, larvae, mealworms and red ant pupae to a diverse and appreciative clientele. TO MATCH FEATURE FOOD-THAILAND/INSECTS REUTERS/Adrees Latif (THAILAND)

Fried grasshoppers are seen fried in pandan leaf at a Bangkok market April 4, 2007. The ice-cream man rings a tinkling bell, the fruit man yells through a loud hailer and the insect man hoots his horn.From three-wheeled carts or shiny metal stalls, the Thai capital's insect sellers serve fried grasshoppers, water bugs, giant flies, larvae, mealworms and red ant pupae to a diverse and appreciative clientele. TO MATCH FEATURE FOOD-THAILAND/INSECTS REUTERS/Adrees Latif (THAILAND)

An insect vendor packages ant pupae for a client at a Bangkok market April 4, 2007. The ice-cream man rings a tinkling bell, the fruit man yells through a loud hailer and the insect man hoots his horn. The ice-cream man rings a tinkling bell, the fruit man yells through a loud hailer and the insect man hoots his horn. From three-wheeled carts or shiny metal stalls, the Thai capital's insect sellers serve fried grasshoppers, water bugs, giant flies, larvae, mealworms and red ant pupae to a diverse and appreciative clientele. TO MATCH FEATURE FOOD-THAILAND/INSECTS REUTERS/Adrees Latif (THAILAND)

A fried scorpion and silkworm pupas are displayed during a gourmet festival in Kunming, Yunnan province December 15, 2006. REUTERS/Wong Campion (CHINA)

Mediterranean fly pupae is seen in a processing plant in El Cerinal, Guatemala March 29, 2006. Every week, Guatemalan scientists blast 2.7 billion fruit flies with radiation to make them sterile in a bizarre nuclear war against one of the world's most destructive farm pests. The flies, a threat to the fruit and vegetable industry in California and Florida, are then dropped from planes to copulate with fertile females in Guatemala, Mexico and the United States. REUTERS/Carlos Duarte

Irradiated pupae is ready to be transported and packed in a processing plant in El Cerinal, Guatemala March 29, 2006. Every week, Guatemalan scientists blast 2.7 billion fruit flies with radiation to make them sterile in a bizarre nuclear war against one of the world's most destructive farm pests. The flies, a threat to the fruit and vegetable industry in California and Florida, are then dropped from planes to copulate with fertile females in Guatemala, Mexico and the United States. REUTERS/Carlos Duarte

Butterflies are released in Palmira, Valle del cauca province January 15, 2004. Colombia is breeding and exporting at least 1,000 butterfly larvae a month as a new type of gift for birthdays, weddings and other events around the world. PICTURE TAKEN ON JANUARY 15. REUTERS/Eduardo Munoz DM

A butterfly ends the metamorphosis process in Palmira, Valle del Cauca province, January 15, 2004. Colombia is breeding and exporting at least 1,000 butterfly larvae a month as a new type of gift for birthdays, weddings and other events around the world. PICTURE TAKEN ON JANUARY 15. REUTERS/Eduardo Munoz DM

A Colombian man looks at some butterflies in Palmira, Valle del Cauca province January 13, 2004. Colombia is breeding and exporting at least 1,000 butterfly larvae a month as a new type of gift for birthdays, weddings and other events around the world. PICTURE TAKEN ON JANUARY 13. REUTERS/Eduardo Munoz DM

A butterfly waits to be released in Palmira, Valle del Cauca province January 13, 2004. Colombia is breeding and exporting at least 1,000 butterfly larvae a month as a new type of gift for birthdays, weddings and other events around the world. PICTURE TAKEN ON JANUARY 13. REUTERS/Eduardo Munoz DM

A butterfly waits to be released in Palmira, Valle del Cauca province January 13, 2004. Colombia is breeding and exporting at least 1,000 butterfly larvae a month as a new type of gift for birthdays, weddings and other events around the world. PICTURE TAKEN ON JANUARY 13. REUTERS/Eduardo Munoz DM

A butterfly larva walks between flowers in Palmira, Valle del Cauca province January 13, 2004. Colombia is breeding and exporting at least 1,000 butterfly larvae a month as a new type of gift for birthdays, weddings and other events around the world. PICTURE TAKEN ON JANUARY 13. REUTERS/Eduardo Munoz DM