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December 5, 2021

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Rare hunting scene raises questions over polar bear diet

A POLAR bear chases a reindeer into the water, drags it ashore and devours it, in a striking scene caught on film for the first time.

With sea ice melting, the king of the Arctic may be changing its diet.

The dramatic spectacle played out in Norway’s Svalbard archipelago on August 21, 2020. In summer, the sea ice retreats and takes with it the seals that make up the polar bear’s main source of food.

A research team from a nearby Polish scientific station watched it happen, and captured a polar bear hunting a reindeer on camera for the first time.

The video shows a young female chasing a male reindeer into the icy waters, catching and drowning it, then pulling it on shore and making a meal of it.

“The whole situation was so amazing that it was like watching a documentary,” said Izabela Kulaszewicz, a biologist at the University of Gdansk. “You could almost hear the voice of a narrator in the background saying that you absolutely have to watch this event, because we will most likely never see anything like it again.”

The scene was so unusual that she co-wrote an article in the scientific journal Polar Biology with two other researchers.

In it, they argued the incident was one of a series of observations that suggest polar bears are increasingly preying on terrestrial animals to make up for their limited access to seals.

In Svalbard, just over 1,000 kilometers from the North Pole and where signposts warn of the danger of polar bears, around 300 sedentary bears live alongside around 20,000 reindeer.

According to the article’s authors, there are indications that polar bears have been hunting reindeer more frequently in recent decades.

They say that two factors are at play: the retreating sea ice is stranding the bears on land for longer periods, and the number of reindeer has been steadily rising on Svalbard since a 1925 hunting ban.

Eating reindeer is therefore a matter of both necessity and opportunity for the furry white beast, they suggest.

However, other experts caution against reading too much into the incident.

“If polar bears were killing reindeer back in the 1950s and 60s, it would have been very rare to see, as there were few people, few bears and few reindeer” in Svalbard at the time, said Andrew Derocher, a professor at the University of Alberta. “Now, with modern media, everyone has a camera, social media and the ‘news’ spreads fast.”

While high-fat, high-calorie ringed and bearded seals make up their main diet, polar bears are also known to feed on eggs, birds, rodents and even dolphins.

Weighing between 70 and 90 kilograms as adults, reindeer would serve as a good complement for the bears during the lean summer period, which has grown longer due to global warming.

Two days after the Polish researchers filmed their video, the same polar bear was observed devouring another reindeer carcass.


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