Wild Polar Bear Maternal Den Disturbance and Cub Welfare

Polar bear maternal dens are critically sensitive to disturbance during the denning period, and industrial activity near den sites threatens cub survival.

Key Facts

Pregnant polar bears enter dens in October-November and remain until March-April, giving birth to 1-3 cubs
Newborn polar bear cubs weigh only 600-700 grams and are entirely dependent on their mother for warmth and nutrition
Den disturbance during the first weeks of life can cause the mother to abandon the den and cubs
Oil exploration seismic surveys near known denning areas have caused den abandonment
Infrared scanning and satellite monitoring now help industry identify den locations to implement buffer zones
Female polar bears return to the same general denning areas each year, creating identifiable hotspots
Cubs born to females in poor body condition from inadequate summer feeding face higher mortality

Welfare Considerations

Den abandonment caused by industrial disturbance leaves newborn cubs exposed to Arctic temperatures where they die within hours. Each cub represents years of reproductive investment and is critically important to population viability. Buffer zones and seasonal restrictions on industrial activity near denning areas are essential, minimally disruptive protections.

What You Can Do

Support policies requiring polar bear den surveys before authorizing industrial activity in denning areas
Advocate for meaningful buffer zones around known polar bear denning habitats
Donate to polar bear research programs that improve den detection and monitoring technology
Learn about the relationship between sea ice conditions and polar bear denning habitat quality
Follow polar bear maternal den emergence tracking programs in spring