Although polar bears' locomotion is similarly inefficient, polar bear cubs walk along with their mother.

尽管北极熊的运动能力同样低下，北极熊幼崽还是和妈妈一起前行。

youdao

Two polar bear cubs play with rubbish along the Barter Island shore.

两个北极熊幼仔在巴特岛海岸玩垃圾。

youdao

Black bear cubs use trees for defense, whereas brown bears and polar bears, which regularly inhabit treeless environments, rely on aggression to protect their cubs.

黑熊幼崽用树来防御，而经常生活在没有树的环境中的棕熊和北极熊则依靠攻击性来保护它们的幼崽。

youdao

It showed polar bear cubs in a den with their mother, with many people assuming the young animals were born and filmed in the Arctic.

BBC: Sir David Attenborough

In 2011, the BBC denied misleading viewers of Attenborough's frozen planet series with footage of newborn polar bear cubs filmed in an animal park, rather than in the wild.

BBC: Africa TV series edited over climate change comment

The move comes a year after an episode of Frozen Planet, featuring a polar bear with her cubs, was criticised.

BBC: Sir David Attenborough