Easy way to get crows to stick around that my grandfather taught me..take a bucket of corn, about 20 pieces of sewing thread about 20" long, and a sewing needle.. use the needle to thread a piece of corn on a piece of string.. knot one end.. pull corn to the knot.. throw the 20 pieces in the bucket with the other corn.. toss the corn out in a field and start calling.. when one shows up and eats a piece of the threaded corn, he will not fly off, just tries to get the thread out of his mouth.. starts distress calling.. (do not shoot him) crows will come from everywhere to assist him... shoot them..
if hunting standing dry corn fields, 3 people walk in in view of the crows, 2 walk out and continue their day.. common crows can't count past 2.. solo shooter is free to shoot for a while..