Crows are scavengers and like to collect shiny things. Why they gather in cemeteries is a mystery to me. All the bodies are buried too deeply to scavenge (that's why folks get put in six feet under). Perhaps they are nature's way of enforcing speed control and decorum in the graveyard.

Why do crows go crazy at dusk?

In daylight, crows can elude or gang up on most predators. At night, they are almost defenseless, so they gather in large flocks to roost in a spot where they have good visibility and reasonable shelter. ... There is more ambient light from houses and street lamps, so crows have a better chance of seeing trouble coming.

Why are crows associated with death?

Many view the appearance of crows as an omen of death because ravens and crows are scavengers and are generally associated with dead bodies, battlefields, and cemeteries, and they're thought to circle in large numbers above sites where animals or people are expected to soon die.