Chapter six looks at how birds navigate and migrate. Birds migrate all over the world as the seasons change. Through experiments and small tracking devices, more is now being learned about how and when birds migrate, which helps with conservation of habitats along migration routes. How birds migrate and navigate is still being studied, but birds are known to use built in magnetic compass, memory and navigational clues during migrations. The bodies of birds also change during migrations. But migrations are risky, with artificial lighting, glass buildings, stormy weather and, now, climate change affecting migratory patterns.