Photo Credits

Title: Frog

Author:  Luis J. Villanueva

License: Attribution-NonCommercial 3.0 Unported (CC BY-NC 3.0)

Title: Chicago highway nighttime

Author: Flickr member Giant Ginko

License: Attribution-NonCommercial 3.0 Unported (CC BY-NC 3.0)

Source: http://www.flickr.com/photos/giantginkgo/4477632539/

Title: Jungle

Author: Bryan Pijanowski

License: Attribution-NonCommercial 3.0 Unported (CC BY-NC 3.0)

Title: Black bird singing

Author: Mark Sadowski

License: Attribution-ShareAlike 2.0 Generic (CC BY-SA 2.0)

Source: http://www.flickr.com/photos/ms4denmark/157672026/

Title: Corn field in Tippecanoe County, IN

Author: Luis J. Villanueva

License: Attribution-NonCommercial 3.0 Unported (CC BY-NC 3.0)