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A female polar bear with her cubs on Bely Island. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences +

A female polar bear with her cubs on Bely Island. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences

A polar bear on Bely Island. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences +

A polar bear on Bely Island. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences

A polar bear on Vilkitsky Island. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences +

A polar bear on Vilkitsky Island. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences

A polar bear on Vilkitsky Island. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences +

A polar bear on Vilkitsky Island. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences

A landing on the island during the 2019 Yamal-Arctic expedition. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences +

A landing on the island during the 2019 Yamal-Arctic expedition. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences

Specialists take basic measurements of a polar bear. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences +

Specialists take basic measurements of a polar bear. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences

A female polar bear after being collared. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences +

A female polar bear after being collared. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences

A female polar bear with her cubs on Bely Island. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences +

A female polar bear with her cubs on Bely Island. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences

Specialists take basic measurements of a polar bear. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences +

Specialists take basic measurements of a polar bear. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences

Specialists take basic measurements of a polar bear. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences +

Specialists take basic measurements of a polar bear. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences

Specialists take basic measurements of a polar bear. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences +

Specialists take basic measurements of a polar bear. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences

Specialists take basic measurements of a polar bear. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences +

Specialists take basic measurements of a polar bear. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences

Zoologists take biological samples of a female polar bear. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences +

Zoologists take biological samples of a female polar bear. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences

Specialists take basic measurements of a polar bear. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences +

Specialists take basic measurements of a polar bear. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences

A female polar bear after being collared. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences +

A female polar bear after being collared. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences

A female polar bear after being collared. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences +

A female polar bear after being collared. Photo by the Severtsov Institute of Ecology and Evolution at the Russian Academy of Sciences