Migration doesn't only take place in the skies. Many animals migrate over land, too.
In this section
A history of migrating herds
Huge herds of migrating animals are an amazing sight.
Mole, vole and toad migration
Every spring, common toads make the short but risky trip from the woods where they spend winter to the ponds to breed.
Why do people migrate?
Humans are also animals, and - like most animals - we migrate.