All content on the ZooPic site are under the Creative Commons Attribution-ShareAlike 3.0 licence.

If you use any elements of the ZooPic site, you have to clearly mark that the content is useable under the mentioned licence. You must also point out the ZooPic site as the source of your content. If you are using the content on the Internet, you have to link back to the ZooPic site - either to the page you used or to the main page.