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

A flock of crows dive-bombed a Vancouver woman eight times as she ran screaming down the street, landing on her head between attacks. In Los Angeles, a homeowner watched crows slam their beaks against his glass door so hard he feared it would shatter. Neither person had done anything to provoke the birds that day. According to a report in The New York Times, the crows were not confused. They were settling an old score, and crow scores can stay open for a very long time.

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Behind these odd, unsettling encounters lies a piece of science that most people never think about: crows can recognise a human face, remember what that face did to them, and hold on to the grudge for close to two decades. They even teach their chicks to hate the same face. For anyone who has ever startled, trapped, or annoyed a crow, that is not comforting news.

Brains Behind The Beak

Crows are not just noisy backyard birds. They mimic human speech, use tools to solve problems, and recognise individual human faces even in a crowded street. They also gather in groups that look strikingly like funerals when a member of their flock, known as a murder, is killed.

That same intelligence gives crows an unusually long memory for insults. A crow can live for about a dozen years, but a grudge against a specific person can outlive the bird that started it, passed down to chicks and flockmates who never even met the original offender.

When Payback Follows You Home

Gene Carter, a computer specialist in Seattle, found this out the hard way. He once chased away crows that were bothering a robin’s nest and threw a rake into the air to scare them off. What followed was nearly a year of retaliation. The birds waited outside his kitchen, dive-bombed him on his way to his car, and tracked him down every single day at his bus stop.

“They were waiting for me at the bus stop every single day,” he said.He told The New York Times the birds followed him for several blocks on his walk home from the stop, swooping at him the whole way. The harassment ended only after he moved out of the neighbourhood.

Spring Is Attack Season

Most crow attacks are not really personal, experts say. They spike in spring and early summer, when parent crows are guarding nests full of chicks and treat anyone who walks too close as a threat.

But grudges built outside nesting season can last far longer than a single breeding cycle. Dr John Marzluff, a professor who has spent years studying how humans and crows interact, has tracked one grudge for 17 years and counting. In 2006, he trapped seven crows on the University of Washington campus while wearing an ogre mask, then released them. The experience rattled the birds and the flockmates who watched it happen.

To measure how long the memory lasted, Marzluff and his team kept putting on the same ogre mask and walking across campus over the following years. Each time, crows responded with loud, aggressive calls that researchers describe as “scolding.” By around the seventh year of the experiment, roughly half the crows he came across were cawing furiously at the mask, even though most of them had not even been born when the original trapping happened.

How A Bird Remembers A Face

Crows owe this to extremely sharp eyesight, tuned to pick up fine details in shapes, patterns and movement, including the layout of a human face. When a crow has a strong experience with a person, whether being trapped and harassed or being fed and cared for, its brain links that specific face to that specific outcome.

The bird is not learning to fear people in general. It is learning to fear, or trust, one particular face. What makes crows especially difficult to shake off is that this information does not stay with one bird. When a crow reacts to a threatening face, other crows watching nearby pick up on the alarm and store that same face as dangerous, spreading the warning through the whole flock without the newer birds ever having a bad experience themselves.

Experts stress that none of this is malice. It is simply how a crow’s brain is built to keep it and its flock safe: notice a face, remember what it did, and pass the word along. The same memory works in reverse too. Crows also remember people who feed them or leave out clean water, and tend to treat those humans kindly for years afterwards. A handful of unsalted peanuts left out regularly, experts say, may be a cheaper way to stay on a crow’s good side than moving house.