Gray herons fly at a lake near the village of Novosyolki, Belarus, June 26, 2016. REUTERS/Vasily Fedosenko 

Visitors walk past a surveillance unmanned air vehicle (UAV) 'Heron TP' by IAI and Airbus Defence at the ILA Berlin Air Show in Schoenefeld, south of Berlin, Germany, May 31, 2016. REUTERS/Fabrizio Bensch 

Workers are silhouetted as they prepare an Airbus Heron drone for the upcoming ILA Berlin Air Show in Schoenefeld, south of Berlin, Germany, May 30, 2016. REUTERS/Hannibal Hanschke 

A worker prepares a Airbus Heron drone for the upcoming ILA Berlin Air Show in Schoenefeld, south of Berlin, Germany, May 30, 2016. REUTERS/Hannibal Hanschke 

A heron flies above the Volga river delta, Kazakhstan, April 10, 2016. REUTERS/Grigory Dukor 

A heron flies above the Volga river delta, Kazakhstan, April 10, 2016. REUTERS/Grigory Dukor 

A heron flies above the Volga river delta, Kazakhstan, April 10, 2016. REUTERS/Grigory Dukor 

A heron sits on the bank of the Volga river delta, Kazakhstan, April 10, 2016. REUTERS/Grigory Dukor 

A heron sits on the bank of the Volga river delta, Kazakhstan, April 10, 2016. REUTERS/Grigory Dukor 

A heron flies above the Volga river delta, Kazakhstan, April 10, 2016. REUTERS/Grigory Dukor 

A heron flies above the Volga river delta, Kazakhstan, April 12, 2016. REUTERS/Grigory Dukor 

A heron flies above the Volga river delta, Kazakhstan, April 12, 2016. REUTERS/Grigory Dukor 

A heron flies above the Volga river delta, Kazakhstan, April 12, 2016. REUTERS/Grigory Dukor 

A heron flies above the Volga river delta, Kazakhstan, April 12, 2016. REUTERS/Grigory Dukor 

Boxing - Kane Heron v Kevin McCauley - The SSE Arena, Wembley - 26/3/16
Kane Heron and Kevin McCauley in action
Mandatory Credit: Action Images / Adam Holt

EDITORIAL USE ONLY. 

Boxing - Kane Heron v Kevin McCauley - The SSE Arena, Wembley - 26/3/16
Kane Heron and Kevin McCauley in action
Mandatory Credit: Action Images / Adam Holt

EDITORIAL USE ONLY. 

Boxing - Kane Heron v Kevin McCauley - The SSE Arena, Wembley - 26/3/16
Kane Heron and Kevin McCauley in action
Mandatory Credit: Action Images / Adam Holt

EDITORIAL USE ONLY. 

Boxing - Kane Heron v Kevin McCauley - The SSE Arena, Wembley - 26/3/16
Kane Heron and Kevin McCauley in action
Mandatory Credit: Action Images / Adam Holt

EDITORIAL USE ONLY. 

Boxing - Kane Heron v Kevin McCauley - The SSE Arena, Wembley - 26/3/16
Kane Heron celebrates his win
Mandatory Credit: Action Images / Adam Holt

EDITORIAL USE ONLY. 

Boxing - Kane Heron v Kevin McCauley - The SSE Arena, Wembley - 26/3/16
Kane Heron and Kevin McCauley in action
Mandatory Credit: Action Images / Adam Holt

EDITORIAL USE ONLY. 

Boxing - Kane Heron v Kevin McCauley - The SSE Arena, Wembley - 26/3/16
Kane Heron and Kevin McCauley in action
Mandatory Credit: Action Images / Adam Holt

EDITORIAL USE ONLY. 

A Striated Heron searches for prey at a pond in MacRitchie Nature Reserve in Singapore March 17, 2016. A plan to build a subway tunnel under Singapore's largest patch of primary rainforest has drawn sharp protests from environmental groups and activists who say it could irreversibly damage the habitats of hundreds of plant and animal species. REUTERS/Edgar Su SEARCH "RAINFOREST CITY" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES 

A heron perches near nests in Regents Park in London, Britain, March 17, 2016. REUTERS/Toby Melville 

A heron perches near nests in Regents Park in London, Britain, March 17, 2016. REUTERS/Toby Melville 

A heron sits on a nest in Regents Park in London, Britain, March 17, 2016. REUTERS/Toby Melville 

A heron sits on a nest in Regents Park in London, Britain, March 17, 2016. REUTERS/Toby Melville 

A heron sits on a tree trunk with construction cranes seen behind in Regents Park in London, Britain, March 17, 2016. REUTERS/Toby Melville 

A heron sits on a tree trunk in Regents Park in London, Britain, March 17, 2016. REUTERS/Toby Melville 

Herons stand on rocks that were once covered by the waters of the Magdalena river, the longest and most important river in Colombia, in the city of Honda, Colombia January 14, 2016. While flooding and intense rain wreak havoc on several countries in Latin America, El Nino brings other harmful effects to Colombia with severe drought. Picture taken January 14, 2016. REUTERS/John Vizcaino 

A purple heron flies over Moeyungyi wetland in Bago division, north of Yangon, Myanmar December 23, 2015. REUTERS/Soe Zeya Tun

A heron is pictured on the banks of Guanabara Bay, at the Niteroi port near Rio de Janeiro, Brazil, December 11, 2015. Before dawn one morning in August, two men disguised as fishermen hid in the dark outside the compound of oil service company on Rio de Janeiro's picturesque Guanabara Bay, the site of next year's Olympic sailing competition. When a pipe began oozing pungent liquid into the stagnant bay, they recorded images on camera and took a water sample. Picture taken on December 11, 2015. REUTERS/Ricardo Moraes 

General view of the refinery of U.S. chemicals group LyondellBasell in Berre, near Marseille, France, October 19, 2015. Picture taken on October 19, 2015. REUTERS/Jean-Paul Pelissier TPX IMAGES OF THE DAY 

A black crowned night heron fishes in a pond in New York's Central Park May 22, 2015. REUTERS/Lucas Jackson

A Fasciated tiger-heron (Tigrisoma fasciatum) that lost its eye is pictured at the Animal Rescue ZooAve in Alajuela May 20, 2015. The National Animal Health Service the Ministry of Environment and Energy have joined forces with the Humane Society International (HSI) to support animal welfare programs, following the increase in violence who are suffering pets and wildlife in the country. Costa Rica has a bill that penalizes animal abuse that has been stalled in Congress, according to local media. Picture taken May 20, 2015. REUTERS/Juan Carlos Ulate 

A grey heron flies over blooming rapeseed field on a spring morning in Vufflens-la-Ville near Lausanne April 23, 2015. REUTERS/Denis Balibouse 

A heron takes off from a sofa floating on Jacarepagua Lagoon, during a press tour in Rio de Janeiro, March 9, 2015. A press tour was organised by biologist Mario Moscatelli, to call attention to pollution on the waters of the lagoons which surround the Rio 2016 Olympic Park. REUTERS/Ricardo Moraes (BRAZIL - Tags: SPORT OLYMPICS ENVIRONMENT ANIMALS) 

French citizen Domitille Heron (C) buys her copy of Charlie Hebdo magazine at Renaud Bray bookstore in Montreal January 16, 2015. With limited issues of the magazine sent to Canada most stores sold reserved copies prior to their delivery. REUTERS/Christinne Muschi (CANADA - Tags: MEDIA CIVIL UNREST CRIME LAW SOCIETY) 

French citizen Domitille Heron (C) buys her copy of Charlie Hebdo magazine at Renaud Bray bookstore in Montreal January 16, 2015. With limited issues of the magazine sent to Canada most stores sold reserved copies prior to their delivery. REUTERS/Christinne Muschi (CANADA - Tags: MEDIA CIVIL UNREST CRIME LAW SOCIETY) 

A heron is seen at Guarapiranga reservoir, during a drought in Sao Paulo November 21, 2014. The Basic Sanitation Company of the State of Sao Paulo (SABESP) is transferring water from Guarapiranga reservoir to supply the population that was served by Cantareira System. Hit by Brazil's worst drought in 80 years, the two main reservoirs, Cantareira and Guarapiranga, serving metropolitan Sao Paulo, South America's largest city, could dry out by February if relief does not arrive in the upcoming rainy season. Today, the Guarapiranga reservoir operates with 33.0% of its capacity and Cantareira system with 9.7%, according to SABESP. REUTERS/Paulo Whitaker (BRAZIL - Tags: DISASTER ENVIRONMENT ANIMALS) 

A great blue heron flies over a salt marsh in the Parker National Wildlife Refuge on Plum Island in Newbury, Massachusetts November 10, 2014. REUTERS/Brian Snyder (UNITED STATES - Tags: ENVIRONMENT ANIMALS TPX IMAGES OF THE DAY) 

Cast member Anna Jacoby-Heron speaks at a panel for the MTV television series "Finding Carter" during the Television Critics Association Cable Summer Press Tour in Beverly Hills, California July 11, 2014. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT) 

A heron flies over the Guarapiranga reservoir in Sao Paulo during sunrise, February 13, 2014. Sao Paulo-based agricultural research institute Cepea said in a report on Tuesday that the hot, dry weather was affecting tomatoes, potatoes and lettuce crops, possibly raising prices of those foods for consumers. Many vegetables and grains have been affected by a month and a half of dry weather in much of Brazil. REUTERS/Paulo Whitaker (BRAZIL - Tags: AGRICULTURE ENVIRONMENT ANIMALS) 

A heron perches on an anchored boat in the Guarapiranga reservoir during sunrise in Sao Paulo February 13, 2014. Sao Paulo-based agricultural research institute Cepea said in a report on Tuesday that the hot, dry weather was affecting tomatoes, potatoes and lettuce crops, possibly raising prices of those foods for consumers. Many vegetables and grains have been affected by a month and a half of dry weather in much of Brazil. REUTERS/Paulo Whitaker (BRAZIL - Tags: ENVIRONMENT BUSINESS ANIMALS MARITIME) 

A heron perches on an anchored boat in the Guarapiranga reservoir during sunrise in Sao Paulo February 13, 2014. Sao Paulo-based agricultural research institute Cepea said in a report on Tuesday that the hot, dry weather was affecting tomatoes, potatoes and lettuce crops, possibly raising prices of those foods for consumers. Many vegetables and grains have been affected by a month and a half of dry weather in much of Brazil. REUTERS/Paulo Whitaker (BRAZIL - Tags: ENVIRONMENT BUSINESS ANIMALS MARITIME) 

An ostrich receives instructions from its trainer Francisco Tito during a show, held to mark International Day of Migratory Birds at the Parque de las Leyendas zoo in Lima May 9, 2013. The zoo houses herons, swans, geese, ducks and parrots among other birds, and trains other animals such as sealions and penguins. REUTERS/Mariana Bazo (PERU - Tags: ANIMALS SOCIETY) 

A hawk is seen during a show, held to mark International Day of Migratory Birds at the Parque de las Leyendas zoo in Lima May 9, 2013. The zoo houses herons, swans, geese, ducks and parrots among other birds, and trains other animals such as sealions and penguins. REUTERS/Mariana Bazo (PERU - Tags: ANIMALS SOCIETY) 

A hawk eats while perched on the hand of its coach during a show, held to mark International Day of Migratory Birds at the Parque de las Leyendas zoo in Lima May 9, 2013. The zoo houses herons, swans, geese, ducks and parrots among other birds, and trains other animals such as sealions and penguins. REUTERS/Mariana Bazo (PERU - Tags: ANIMALS SOCIETY) 

A hawk lands on the hand of his coach Oscar Beingolea during a show, held to mark International Day of Migratory Birds at the Parque de las Leyendas zoo in Lima May 9, 2013. The zoo houses herons, swans, geese, ducks and parrots among other birds, and trains other animals such as sealions and penguins. REUTERS/Mariana Bazo (PERU - Tags: ANIMALS SOCIETY) 

An ostrich is seen during a show with ostriches and hawks, held to mark International Day of Migratory Birds at the Parque de las Leyendas zoo in Lima May 9, 2013. The zoo houses herons, swans, geese, ducks and parrots among other birds, and trains other animals such as sealions and penguins. REUTERS/Mariana Bazo (PERU - Tags: ANIMALS SOCIETY) 

An ostrich catches a ring with its neck during a show with ostriches and hawks, held to mark International Day of Migratory Birds at the Parque de las Leyendas zoo in Lima May 9, 2013. The zoo houses herons, swans, geese, ducks and parrots among other birds, and trains other animals such as sealions and penguins. REUTERS/Mariana Bazo (PERU - Tags: ANIMALS SOCIETY) 

A German Bundeswehr armed forces pilot operator (L) and an aerial vehicle operator control a Heron 1 unmanned aerial vehicle (UAV) on a mission, from their Advance Ground Control Station at the Marmal army camp in Mazar-e-Sharif, northern Afghanistan December 11, 2012. German air forces are using the reconnaissance drone aircraft for the ongoing International Security Assistance Force (ISAF) mission. REUTERS/Fabrizio Bensch (AFGHANISTAN - Tags: MILITARY CONFLICT) 

A German Bundeswehr armed forces pilot operator controls a Heron 1 unmanned aerial vehicle (UAV) on a mission from their Advance Ground Control Station at the Marmal army camp in Mazar-e-Sharif, northern Afghanistan December 11, 2012. German air forces are using the reconnaissance drone aircraft for the ongoing International Security Assistance Force (ISAF) mission. REUTERS/Fabrizio Bensch (AFGHANISTAN - Tags: MILITARY CONFLICT) 

A German Bundeswehr armed forces Heron 1 unmanned aerial vehicle (UAV) takes off for a mission from the Marmal army camp in Mazar-e-Sharif, northern Afghanistan December 11, 2012. German air forces are using the reconnaissance drone aircraft for the ongoing International Security Assistance Force (ISAF) mission. REUTERS/Fabrizio Bensch (AFGHANISTAN - Tags: MILITARY CONFLICT) 

Civil contractors make the final technical checks on a German Bundeswehr armed forces Heron 1 unmanned aerial vehicle (UAV) before it takes off for a mission at the Marmal army camp in Mazar-e-Sharif, northern Afghanistan December 11, 2012. German air forces are using the reconnaissance drone aircraft for the ongoing International Security Assistance Force (ISAF) mission. REUTERS/Fabrizio Bensch (AFGHANISTAN - Tags: MILITARY CONFLICT TRANSPORT) 

Civil contractors make the final technical checks on a German Bundeswehr armed forces Heron 1 unmanned aerial vehicle (UAV) before it takes off for a mission at the Marmal army camp in Mazar-e-Sharif, northern Afghanistan December 11, 2012. German air forces are using the reconnaissance drone aircraft for the ongoing International Security Assistance Force (ISAF) mission. REUTERS/Fabrizio Bensch (AFGHANISTAN - Tags: MILITARY CONFLICT TRANSPORT) 

Civil contractors make the final technical checks on a German Bundeswehr armed forces Heron 1 unmanned aerial vehicle (UAV) before it takes off for a mission at the Marmal army camp in Mazar-e-Sharif, northern Afghanistan December 11, 2012. German air forces are using the reconnaissance drone aircraft for the ongoing International Security Assistance Force (ISAF) mission. REUTERS/Fabrizio Bensch (AFGHANISTAN - Tags: MILITARY CONFLICT TRANSPORT) 

A German Bundeswehr armed forces Heron 1 unmanned aerial vehicle (UAV) is wheeled out from an aircraft hanger before taking off for a mission at the Marmal army camp in Mazar-e-Sharif, northern Afghanistan December 11, 2012. German air forces are using the reconnaissance drone aircraft for the ongoing International Security Assistance Force (ISAF) mission. REUTERS/Fabrizio Bensch (AFGHANISTAN - Tags: MILITARY CONFLICT TRANSPORT) 

A grey heron stands in a pond near the town of Zikhron Ya'akov in northern Israel October 26, 2012. REUTERS/Baz Ratner (ISRAEL - Tags: ENVIRONMENT ANIMALS) 

A grey heron takes flight from a pond near the town of Zikhron Ya'akov in northern Israel October 26, 2012. REUTERS/Baz Ratner (ISRAEL - Tags: ENVIRONMENT ANIMALS) 

Tekzilla host Robert Heron prepares to film an episode at Revision3 in San Francisco, California, October 3, 2012. Revision3 is part of an entire new industry of YouTube "networks" - a cross between talent agencies and old-school movie studios have emerged, bringing hierarchy to an ecosystem that looks more like Hollywood by the day. A year ago this month, YouTube embarked on an initiative to invest hundreds of millions of dollars to acquire original, professional content in an effort to compete for ad dollars against traditional television networks, digital streaming services such as Netflix and rival Internet companies like AOL and Yahoo. Picture taken October 3.
REUTERS/Noah Berger (UNITED STATES - Tags: ENTERTAINMENT BUSINESS SCIENCE TECHNOLOGY)