Extras

    Video thumbnail: Science Trek D4K: The Web Show: Bird Migration

    Science Trek

    D4K: The Web Show: Bird Migration

    How do birds know where to go?

    D4K: The Web Show: Bird Migration

    Video thumbnail: Science Trek D4K: Bird Migration Video Short

    Science Trek

    D4K: Bird Migration Video Short

    Why is bird migration like your bus ride to and from school?

    D4K: Bird Migration Video Short