On its own shoelaces are interesting. Pulling on the loose end may have started as curiosity.
The person then puts the pan down to tie them. Crow grabs the lace again because, again, curious and playful (birds can be incredibly mischievous), and once again the pan reappears!
Now we're in reinforcement territory.
Now don't get me wrong, the crow learns fast. But it still could be just basic reinforcement of a natural behavior, which is the same technique used to teach various animals "tricks".
On its own shoelaces are interesting. Pulling on the loose end may have started as curiosity.
The person then puts the pan down to tie them. Crow grabs the lace again because, again, curious and playful (birds can be incredibly mischievous), and once again the pan reappears!
Now we're in reinforcement territory.
Now don't get me wrong, the crow learns fast. But it still could be just basic reinforcement of a natural behavior, which is the same technique used to teach various animals "tricks".