Half of all bird species undertake annual migrations, everything from heavy-bodied swans to delicate hummingbirds. Migration is one of the most remarkable phenomena on the planet, hosts of animals of all shapes and sizes demonstrating incredible feats of endurance.

We live on an ever-moving planet, and as landscapes are altered, wildlife must march to its rhythm. Driven by instinct, they follow the maps hardwired into their DNA. Some run, some fly, but most swim.

Migration is one of the great phenomena of the natural world. When it’s time to move some take to the skies or the oceans, but the migrants we know best are found in the awe-inspiring herds running across our planet.