Only the toughest animal species can endure the extreme weather, scarce food and limited oxygen available on the Earth’s highest mountains. Watch Hostile Planet Mondays 9/8c on National Geographic.

These animals have adapted to survive in the toughest environments on Earth.

At just a few days old, these baby barnacle geese can't fly, so they jump off a cliff to get to the nearest food source.

Gelada monkeys are the last grass-eating monkey species left in the world.

They live only in the Ethiopian highlands and travel in large family groups.

Golden eagles battle over scarce food supplies.

A snow leopard stalks his prey.

You goat this, baby goat!

Watch Hostile Planet Mondays 9/8c on National Geographic.