Crows are amazingly intelligent animals. My GF and I went to the beach about a month ago and took our dog. The crows weren't frightened at ALL of our dog. They realized they could basically just 'float' up in the air when he came by using the breeze. The fact that they were amazingly calm about it was really telling. Second. We hid our stuff under a blanket. They realize it's still there as they have item persistence…
Yeap. Food and valuables have to be toddler-proofed around crows. They can also steal your wallet or your keys if you leave them unsecured. And, damn, they're as good as human thieves at reading situations for opportunism.
I realized that they are probably aware of my lack of attention to my food and that their in-built modeling of other agents had given them an advantage in this situation. I thought it was pretty impressive.