Photos for Class provides a nice place for students and teachers to find images licensed under Creative Commons. The site even attaches citation to the images!
From the site:
"Teachers have told us they need a place to access safe images that are available to be used in the classroom and for educational purposes. Plus, they want accurate image citations. We’ve heard you and created “Photos For Class” to meet your needs for images! "
Here I searched for cheetah pictures:
I downloaded the first image and this is what is looks like:
As you can see, the photo contains attribution and cites the author and location on the Internet. If you or your students need images, check out Photos for Class!