Matt Sewell is back with a personal selection of the most amazing mammals, birds, reptiles, fish, insects and even plants that battle through the Earth’s toughest conditions in order to survive. Follow flocks of arctic terns on their annual 40,000-kilometre journey between the Earth’s poles. Join the monarch butterflies on their famous pilgrimage from Canada to Mexico. Be awestruck by wildebeest, humpback whales, salmon, dragonflies and more. Find out how they navigate on their impressive journeys - by using chemicals, the sun and the Earth’s magnetic field.