This is the story of two young animals forced to grow up fast. In Africa's savannah a baby elephant shrew learns how speed is the secret to survival amongst the largest animals on Earth; and in America a young grasshopper mouse confronts the Wild West's deadliest creatures to stake a claim of his own.

This is the story of two tiny animals coming of age. In the wild woods of North America, a young chipmunk is gathering a vital store of nuts ahead of his first winter - in his way are ruthless rivals and giant predators. In the steaming rainforest, a young tree-shrew is forced deep into the jungle to find food. She must draw on all her intelligence and agility if she is to escape the ultimate jungle predator - a reticulated python!