A recent study shows that crows remember the faces of threatening humans, and would subsequently react by scolding and prompting other crows to mock the threatening humans. Given that crows have impressive memories, people who ruffle the feathers of these birds could experience years of retribution.
Verdict: The caveman mask prompted the birds into a collective response to a threat. They cawed and screeched, angrily flapped their wings and flicked their tail to warn of the danger, a behaviour called scolding.
But the Cheney mask elicited no response.
The study shows the memory lasts at least five years and counting. Wild crows can live 15-40 years in the wild, so if you ever anger a crow in your teenage years, they'd still be aiming for you even when you're 40.
Conclusion: Never anger a crow.