Crows

I learned something about crows that I never knew. I know that they are a rather clever breed of bird and have always liked them.
 My wife likes to feed the pigeons with some bread in the mornings and I noticed a couple of crows had joined the party. They were not as bold as the pigeons, who are quite used to us and feed right by the door. The crows though would swoop in and grab a piece of bread then land on the sand nearby and bury it.
 I have never seen this behavior before. They continued doing this until all the bread was gone and only then would go to their hidden treasures, dig them back up and eat. Even though they had hidden the bread in many different locations they did not forget any.