ナショナルジオグラフィックさんのインスタグラム写真 - (ナショナルジオグラフィックInstagram)「Video screenshot by Bertie Gregory @bertiegregory | A male polar bear stretches on the west coast of the Hudson Bay in Canada. These huge bears can weigh up to 1,600 pounds (726 kilograms). This particular male was in no rush. He was waiting at the water’s edge in anticipation of the big freeze, an annual event when Arctic waters turn into a rock-solid ice pathway. This ice allows him to hunt his primary prey, the ringed seal. Our warming climate is delaying the arrival of the big freeze by about a day each year. That means that this bear has lost a month of the hunting time that previous generations relied on. To see this guy in action and to learn more about polar bears’ incredible lives, check out my new online series, ‘Wild_Life: The Big Freeze’ at natgeo.com/wildlife or on National Geographic YouTube. Content sponsored by @ExploreCanada.」7月20日 0時41分