Polar Bear Leftovers Feed 13 Arctic Species

A new scientific study has found that polar bears play a far greater ecological role in the Arctic than previously understood. Beyond their status as apex predators, polar bears act as crucial providers of carrion, supplying food to at least 13 other species through the remains of seal carcasses they leave behind on sea ice. The findings were published in the journal Oikos, October 28, 2025.

Researchers estimate that polar bears leave millions of kilograms of uneaten seal meat and blubber each year. This biomass becomes a vital food source for a wide range of scavengers across the Arctic. According to the study, 11 species have been directly documented feeding on polar bear leftovers, while two additional species are considered likely consumers, bringing the total to 13.

Confirmed scavengers include Arctic foxes, Arctic wolves, wolverines, ravens, gulls, snowy owls, and even grizzly bears in overlapping territories. Other polar bears also feed on these carcasses, especially during winter when food is scarce. Several seabirds and small mammals are also suspected to rely on these remains, though evidence is still being gathered.

Stark Warning for Polar Bear

Scientists highlight that the carrion provided by polar bears represents a major and reliable energy source in one of the harshest environments on Earth. The fat-rich seal remains can sustain various species for weeks or even months, particularly during periods of extreme cold when hunting opportunities are limited.

However, the study also issues a stark warning. Rapid sea ice loss driven by climate change threatens polar bear populations, which in turn could drastically reduce the availability of carrion in the Arctic. Without this steady supply of energy, scavenger networks may face severe disruption. No other predator in the region provides such a large and consistent source of marine-derived carrion.

Researchers emphasize that conservation strategies must recognize the broader ecological function of polar bears. “When we lose polar bears, we lose more than a species,” Holly E. L. Gamblin, correspondence writer from University of Manitoba notes. “We lose an entire energy system that supports life across the Arctic.” (Wage Erlangga)