To Daryl's point. I live in what was once a pretty reliable crow flyway, in a small agricultural community in So. NV.
Me and my hunting bud were mad scientists, when it came to shotgun ballistics. Being avid hunters, and competitive pigeon shooters, we more than demanded proof. We tested everything, both on paper, and on actual birds.
One day we decided to test some loads on long range migrating crows. With my friend Chuck checking crow altitudes with a laser rangefinder, I would make, or attempt to make stupid-high pass shots at the passing crows. Guns used: An Ithaca Mag 10, and a Perazzi Pigeon gun with 35k and 40k chokes. We couldn't afford to have the NASA Space Agency confirm our findings, but the 12 ga was killing crows out to what we concluded was the lethal limits of the shot size, independent of the added payload of the Mag 10.
The max of the no fly zone was about 90 yards straight up.
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