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Crows (and ravens as well) are quite intelligent. They know what to look for when scavaging, and have easily associated people with food supplies (trash). They also know what signs to look for, like increases squirrel activity, which also means more food.
Since they are a communal bird species, they are drawn together for companionship and safety, and since they roost at night, are easily spotted moving to and from their roosting sites.
Since they aren't likely to stick together through most of the day, if they are hanging around your area in large numbers, there is probably a food source that is keeping them there.
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