Frozen Seas

The Arctic and Antarctic, where constantly changing conditions affect the outcome of battles fought there. Seals rely on melting ice to keep polar bears at bay, but when it refreezes the tables are turned, while guillemot chicks face having to leave their cliff-top nests prematurely.

Este episódio visita o Ártico e a Antártida, onde a mudança constante das condições do mar, do gelo e da neve influenciam as batalhas travadas lá, por e entre ursos polares, focas e pinguins.