Journey North Hummingbirds fly backwards and upside-down Journey North: Hummingbird Journey North "Hummingbird characteristics" Journey North: Hummingbird Hummingbird Characteristics Hummingbird Characteristics Hummingbird Characteristics http://www.learner.org/jnorth/search/HummerNotes1.html Journey North Hummingbird Characteristics "Hummingbird characteristics" Hummingbird Characteristics "Hummingbird characteristics" http://www.learner.org/jnorth/search/HummerNotes1.html