The head of the Polar Bear Program Jon Aars changes the GPS collar of a female polar bear in eastern Spitzbergen, in the Svalbard archipelago, on April 15, 2025,. The Norwegian Polar Institute, an Arctic research organisation, organised a five-week expedition aboard the high-tech research vessel and icebreaker Kronprins Haakon to collect adipose tissue biopsies and blood samples from polar bears in order to study the impact of pollutants on their health. (Photo by Olivier MORIN / AFP)