Magpies: Murder, Mischief and Myth
10 of the Smartest Animals on Earth
7 brainy reasons why crows and ravens are the smartest birds in the world
Crows Are Even Smarter Than We Thought, Air & Space Magazine
Why Ravens and Crows Are Earth's Smartest Birds
Who's the Smartest Bird? –
On The Wild Side: Ravens are among the world's most intelligent birds – Beach Metro Community News
World's smartest birds - Welcome Wildlife
13 Strange Reasons Why Crows And Ravens Are Definitely The Smartest Birds, Hands Down : ScienceAlert