Cool story. Animal intelligence fascinates me. I think it tends to be low in most birds, simply because fluid intelligence doesn't confer much of an improvement in survival odds when you've already got flight plus a nice assortment of instincts. But obviously there are exceptions, such as corvids.

An old farmer at my local farmers' market talked to me once about the intelligence of crows. He said they would watch when he planted corn, then return days later and pull the grains out by the shoots, often clearing entire rows in his field.

He tried numerous tactics to frighten them away, but the only plan that proved effective was to shoot one with his shotgun and leave it out for the others to see.

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