The MosT Intelligent Birds: CrOws & Ravens

With the highest brain volume relative to its body mass, they may be the brightest of all birds! 

See for yourself

Similar species CROWS and RAVENS
ClicK & Learn:
http://www.allaboutbirds.org/page.aspx?pid=2501

Watch and learn how they´re different from each another

The modern raven was present during the North American Pleistocene (1.8 million to 10,000 years ago).

Here is an Aesop´s fable 

"The Crow and the Pitcher"