Research Shows Crows Can Hold Grudges for Up to 17 Years
In a stunning discovery that highlights the complex intelligence of birds, scientists have found that crows are capable of remembering human faces and holding grudges for up to 17 years. The study, conducted over nearly two decades by researchers in the United States and Japan, reveals that crows possess long-term memory and emotional depth far beyond what was previously understood.
The research began in the early 2000s when scientists wearing distinct masks "captured" and released wild crows. What followed was nothing short of remarkable. Years after the incident, the crows would still aggressively react to individuals wearing those same masks, attacking or cawing warnings to fellow birds—even if they had not seen them for over a decade.
What's more fascinating is that new generations of crows, who were never captured, also learned to associate the mask with danger, suggesting that crows are capable of teaching others about threats through social learning.
Dr. John Marzluff, a wildlife science professor and one of the lead researchers, said, “This kind of memory and social transmission is extremely rare in the animal kingdom. It means that crows not only remember, but also share their experiences, much like humans do.”
The findings align with what many indigenous cultures have believed for centuries—that crows are not just clever, but deeply perceptive and emotionally aware. This research is also prompting a re-evaluation of how scientists view bird intelligence in general.
Aside from holding grudges, crows have shown the ability to use tools, solve puzzles, recognize themselves in mirrors, and even mourn their dead—traits once thought exclusive to primates.
So the next time you see a crow eyeing you from a rooftop, remember: they might just remember you too—and they never forget a face.