I once watched a documentary where a polar bear was unable to hunt. In one last ditch effort it tried to hunt a walrus from a large group but failed. He didn't

I once watched a documentary where a polar bear was unable to hunt. In one last ditch effort it tried to hunt a walrus from a large group but failed. He didn't have enough energy left to kill. Felt so bad for him. The narrator said the bear Wouldn't survive long. Nature is brutal.