6/6 Steve Leonard attempts to migrate across Canada with a heavily-pregnant caribou.
4/6 Steve Leonard trails wild dogs leaving the safety of their pack, heading for the unknown.
3/6 Steve Leonard sets off to travel with three young ospreys on their first ever migration.
2/6 Steve Leonard follows grey whales as they make the longest migration on the planet.
1/6 A polar bear and her cub travel 3,000 miles trying to find food.