A US Army M1A2 SEP tank participates in the Strong Europe Tank Challenge 2017 at the military training area in Grafenwoehr, Germany, 12 May 2017. Six North Atlantic Treaty Organization (NATO) nations and partner nations, Austria, France, Germany, Poland, Ukraine and the USA are taking part in this competing exercise. (Photo by Christian Bruna/EPA)

Workers attempt to bring a tranquillised black rhino to the ground before dehorning in an effort to deter the poaching of one of the world's endangered species, at a farm outside Klerksdorp, in the north west province, South Africa, February 24, 2016. (Photo by Siphiwe Sibeko/Reuters)

A man holds on a rope as he tries to board a truck while crossing floodwaters brought by typhoon Koppu that battered Candaba town, Pampanga province, north of Manila October 20, 2015. Typhoon Koppu swept across the northern Philippines killing at least nine people as trees, power lines and walls were toppled and flood waters spread far from riverbeds, but tens of thousands of people were evacuated in time. (Photo by Romeo Ranoco/Reuters)

A woman holds a parasol as she stands in a field of fireweed, or Kochia scoparia, on a sunny autumn day at the Hitachi Seaside Park in Hitachi, north of Tokyo, October 26, 2015. Fireweed is a grass bush that takes on a bright red colour in autumn. (Photo by Thomas Peter/Reuters)

A photographer takes a snapshot of the reflection of balloons as they take off from Balloon fiesta park in Corrales, N.M., near a north diversion channel reservoir Wednesday, October 7, 2015. (Photo by Roberto E. Rosales/Albuquerque Journal via AP Photo)

The wreckage of a van is overgrown by plants in Simacem village in North Sumatra, Indonesia, November 16, 2015. The village was abandoned following the eruption of Mount Sinabung as it was considered too close to the still rumbling volcano. (Photo by Binsar Bakkara/AP Photo)

Two young women huddle up in their coats as they brave the cold in Newcastle, England on February 1, 2019. Women in skimpy dresses and men in t-shirts enjoyed a drink and a dance as they celebrated January finally being over. (Photo by Will Walker/North News and Pictures)

Students from the University of St Andrews jump into The North Sea, as a good luck tradition before exams start on the East Sands in St Andrews, Fife, Scotland on May 1, 2018. (Photo by Derek Allan/Alamy Live News)