'I know their names, what they eat': tracking polar bears on Svalbard's shifting icescapes

For more than 20 years, scientists have followed the animals in Norway's Arctic archipelago to understand how they may adapt to changing threats as the ice they depend on meltsWhen Rolf-Arne ?lberg is hanging out of a helicopter with a gun, he needs to be able to assess from a distance of about 10 metres the sex and approximate weight of the moving animal he is aiming at, as well as how fat or muscular it is and whether it is in any distress. Only then can he dart it with the correct amount of sedative. Luckily, he says, polar bears are "quite good anaesthetic patients".?lberg is a vet working with the Norwegian Polar Institute, the body responsible for the monitoring of polar bears in Svalbard, an archipelago that lies between mainland Norway and the north pole. Every year he and his colleagues track the bears by helicopter, collect blood, fat and hair samples from them and fit electronic tracking collars. Continue reading...