Mountains cover almost a quarter of the earth's land surface, and they are some of the most challenging places for animals to live. It's hard enough surviving on these sheer cliffs and snowy mountainsides if you're an experienced adult, but for a baby it's an immense struggle. Mountain babies must battle extreme weather and hungry predators. With food difficult to find, they have to work hard for every mouthful. Just getting around this hazardous environment is a tough ask for the youngsters.Meet the clumsy guanaco calf who has to stand up within minutes of being born, the wild mountain goat kid crossing raging mountain rivers and a young musk ox escaping from the jaws of hungry wolves. This programme follows the story of these youngsters through the most dangerous days of their lives. It's a huge adventure, and all these trials must be overcome if they are to grow up to become successful adults.