SONY BBC EARTH

The filmmaker explores how different species push the limits of flight, using speed, strength and endurance to master the skies in their own unique ways.

As the competition in the sky is intensifying, the filmmaker explores the different ways animals struggle to survive in their aerial environment.

Jessie Holmes travels to the mountainous region in search of nourishment. Later, Ricko DeWilde brings his children to the open waters for a crucial lesson in wilderness survival.

Procuring food becomes largely unreliable for the inhabitants of the Arctic tundra. Meanwhile, they must rely on timing and luck as fire and ice act as both aids and hindrances.

With winter coming, residents rush to make the most of the remaining warmth and resources.

Driven by necessity, survivalists push deeper into the wild in a relentless pursuit of food and security.

Six adventurers train with remote tribes, take part in traditional sports and push their physical and mental limits in intense cultural challenges across the world.

Six adventurers train with remote tribes, take part in traditional sports and push their physical and mental limits in intense cultural challenges across the world.

Six adventurers train with remote tribes, take part in traditional sports and push their physical and mental limits in intense cultural challenges across the world.

Harsh deserts force animals to come up with ingenious ways of coping with hostile conditions, thereby giving rise to some of the most incredible survivors on earth.

Grasslands support vast wildlife, but in order to survive here animals must endure the most hostile seasonal changes on the planet.