All About Birds: Common Raven – Listen to a raven, learn where you can find them and more.
Audubon: How to Tell a Raven From A Crow – Offers picture and sound comparisons.
Mental Floss: 10 Fascinating Facts About Ravens – In addition to being very smart creatures, ravens like to have fun…find out how with the interesting facts in this article.
The Valley of the Ravens – The Secrets of Nature
What Is the Difference Between a Raven and a Crow
Smartest Bird (the intelligent raven solves the puzzle)
The Great and Terrible Raven: Its Place in Mythology and Legend | Documentary