The 1986 nuclear disaster in Chernobyl turned the area into a wasteland and the Ukrainian city into a ghost town where no one has lived for more than 30 years - no human anyway.
When 120,000 people were told evacuate after the explosion at Chernobyl's nuclear power plant sent a radioactive cloud over Europe - and many were forced to abandon their beloved dogs.
Now, their descendants roam the exclusion zone: some 900 stray dogs are living in and around the Chernobyl nuclear plant, pushed out of the nearby forest by wolves, and drawn to the contents of its bins and scraps thrown by the workers.
While no one has lived within the 18.5mile exclusion zone for 31 years, some 3,500 people commute to work at the nuclear plant every day.
These workers have taken pity on the dogs and feed them, often allowing them inside the plant during the harsh Ukrainian winter, according to U.S. charity Clean Futures Fund (CFF).
CFF is a Michigan-based non-profit organisation that pursues humanitarian projects at Chernobyl, and is providing medical treatment to the strays in the exclusion zone.
As hundreds of dogs still live in areas with radioactive contamination, scientists and radiation experts from around the world have taken an interest in the strays for research purposes.
After the dogs are captured, they are spayed and vaccinated, before some are being fitted with special collars equipped with radiation sensors and GPS receivers in order to map radiation levels across the zone.
This helps scientists study their radiation exposure and gives them access to areas of Chernobyl where humans would not normally have access due to possible health risks.