Derived from Animated Sprites and Textures by Spiney
http://opengameart.org/content/animated-sprites-and-textures

Licenses:
http://creativecommons.org/licenses/by/3.0/
http://creativecommons.org/licenses/by-sa/3.0/
http://www.gnu.org/licenses/gpl-3.0.html
http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
http://creativecommons.org/publicdomain/zero/1.0/