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An interesting website:

http://www.cracked.com/article_19042_6-terrifying-ways-crows-are-way-smarter-than-you-think.html

In addition, I read:

Crows are as intelligent as CHILDREN: Study reveals birds are as clever as a seven-year-old huma
- They are the only non-primate species known to make tools, such as prodding sticks and hooks, which they use to pick up out grubs
- New study has shown that the birds could worked out how to obtain floating food rewards by dropping heavy objects into water-filled tubes

Crows and ravens are in the same family. The difference is in their size: Crows average around 17 inches long, and ravens about 24-27.
A raven weighs about four times that of a crow. Crows have a wing span around 2.5 ft., and ravens about 3.5-4 ft.

I guess Edgar wasn't kidding...

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