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…
Gulls are pretty smart too. I've seen a flock case out a tourist as they set up their beach blanket. Once the tourist turns their back, they swoop in. I've seen a one pull a closed brown lunch bag out of a freshly opened backpack, meaning the knew backpacks probably have food and brown bags are worth stealing and inspecting in detail elsewhere.
Clearly, gulls are the honey badger of the bird world!