
Short answer Crows recognize individual human faces and are known to spread word of dangerous people with their calls.
A crow is staring right at you. Those eyes might remember your face.
Crows can pick out individual human faces. When they see a threatening face, brain regions linked to attention and fear light up.
I did nothing to a crow yesterday, right?
Crows are thought to pass word of dangerous people to other crows through their calls.

A crow carrying off a cookie from the trash. Crows are also known for using tools.
Ravens can even recognize themselves in a mirror. There's a reason they have a reputation for brains.
So around crows, it's safer to mind your manners.
I'd better be good in front of crows
Sources
Photo credits
- American crow (Corvus brachyrhynchos hesperis) Banff.jpg, Charles J. Sharp, CC BY-SA 4.0 (source)
- PD106514-ARW american crow scavenges discarded christmas cookie from trash.jpg, Paul Danese, CC BY-SA 4.0 (source)
More useless facts
AnimalsSea Otters Hold Hands While They SleepSea otters hold hands in their sleep for a reason
AnimalsThere's a Rat That's 37 Years OldA regular mouse lives 2 to 3 years, but this rat lives more than 37
AnimalsKoala Fingerprints Can Pass for Human OnesEven under an electron microscope, koala and human fingerprints are hard to tell apart
SpaceThe People Who See 16 Sunrises a DaySpace station crews see the sun rise more than fifteen times a day