It’s true that corvids are amazing. An off islander had dropped a tree that had a nest of crowlets in it and he took them to a friends place and one actually survived and lived with them for over two years. One day the same logger came by to check on the young survivor and it attacked him furiously and it had never shown any sign of aggression towards a human previously.
I had a dog that always barked at deer that came into our clearing until he saw my wife watering a patch of grass for them and never he never barked at another one.
The mask test might be a good one,but then, the deer that know you might just think you had a hard night out on the town
the night before(grin).