为给定的主题提供三个纪录片名称，每个纪录片名称包含一两句话的概述/简短的描述。


主题：极地熊
1. "Polar Bears: Ice Bear" - This documentary follows the life of a female polar bear and her cubs as she navigates through the changing Arctic landscape.
2. "Arctic Tale" - This film chronicles the life of a young polar bear and a walrus calf as they face the challenges of survival in the harsh Arctic environment.
3. "To the Arctic" - Narrated by Meryl Streep, this documentary takes viewers on a journey to the Arctic to learn about the lives of a mother polar bear and her two cubs as they navigate through melting sea ice.