Don't scare a crow: Crows hold grudges for nearly a decade, they never forget a face, and even teach their chicks to hate the same face

Crows possess remarkable facial recognition and hold grudges for nearly two decades. These intelligent birds teach their young to remember and avoid specific human faces. Parent crows aggressively protect their nests during spring and early summer months. However, long-held grudges can persist far beyond the nesting season. Remembering kind gestures also leads crows to treat helpful humans favorably.