The crows I feed in our backyard are very cautious.
I threw out half a bag of old Tostitos for them about ten minutes ago. One of the crows has been perched on top of a pine tree just on the other side of our fence, gazing down at the Tostitos and scanning the area, for about five minutes now, but hasn't yet descended into the yard to eat. I haven't even heard him caw out to his family that he's found food.
I think the problem might be that it's rainy and sort of dark outside, and since we have our kitchen light on, he can see through the sliding glass doors to the table and watch me and Jessica and Elyse as we drink our chocolate milk (and coffee, in my case) and eat our muffins and plan (I'm sure he believes) his capture.
Or maybe he thinks if he waits long enough, I'll throw out some salsa or queso to go with the Tostitos.