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Discover why protecting denning moms and cubs is so important — and learn about the work we are doing to help keep families safe.
And in a warming Arctic, where polar bears face enormous challenges, the survival of every cub is increasingly important.
Polar bear cubs are born blind, lightly furred, and weigh only about half a kilogram (one pound). During the first months of their lives, they stay sheltered from the world in snow dens, depending completely on their mothers for food, warmth, and protection.
As part of our ongoing conservation efforts, Polar Bears International has a long history of polar bear denning research, working with a range of partners. The knowledge gained can make a real difference for polar bear families — informing policy and helping to ensure critical protections.
Den Emergence Study
This collaborative maternal den study is the first to combine satellite tracking collars with remote camera traps, offering a unique look at polar bear denning behaviour in the Arctic.
Den Detection Tools
Our team is researching whether synthetic aperture radar, attached to an aircraft, can be used to find polar bear dens hidden under the snow.
Our ongoing den research provides a scientific framework that can help inform policy and management decisions. For example, our chief scientist, Dr. Steven Amstrup, testified before the U.S. Congress on the need to protect moms and cubs in the Arctic National Wildlife Refuge.
“Additional disturbances to denning sites cannot be allowed if we really care about the future of this population,” he told lawmakers.
Uncovering the secrets of polar bear dens
Learn about the history of Polar Bears International's maternal den research.
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Article | 7 min | Mar 2, 2026
Share the Science to Protect Moms and Cubs
This International Polar Bear Day, you can help protect moms and cubs by sharing what we know about polar bear denning. When you share this science, you are supporting informed decision making and elevating the needs of denning polar bear families.
Article | 4 min | Feb 11, 2026
Modeling a Future for Polar Bears: Dr. Louise Archer
PBI postdoctoral researcher Dr. Louise Archer discusses her work in polar bear research and shares tips for those wanting to get into the field.
Article | 5 min | Feb 5, 2026