Ruby-throated Hummingbird by Matt Tillett (Flickr: Ruby-throated Hummingbird) [CC-BY-2.0], via Wikimedia Commons

 I found this hour long online movie about bird migration across the Gulf of Mexico a couple of days ago.  It does a good job of  documenting the amazing migration that many North American birds go through each Spring and Fall.  Birds as small as the Ruby-throated Hummingbird fly non-stop from the Yucatan to the Gulf coast of the US on their way to their breeding grounds further North, a trip that can take most of a day and cover 600 or more miles.  The fall sees a similar migration in the opposite direction back to the wintering grounds in Central and South America.