they used to make cardboard goose decoys that were two silhouettes connected at the back. you put a stick on the inside across the bottom to spread it out to a more 3D affect.
with crows being a little smarter the the average bird brain - that might give you a better look.
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"If there is a heaven it must have thinning aspen gold, and flighting woodcock, and a bird dog" GBE
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