Scientists have proven that crows hold grudges longer than humans
They can be offended for 17 years.
Crows can take offense at people who have offended or threatened them for up to 17 years.
The Daily Star writes about it.
Ornithologists claim that birds are either unable or unwilling to let go of memories of threats. Experts insist that crows use their surprisingly good minds to take years of revenge on anyone or anything that dares to hurt them.
Their revenge missions have led to the residents of some cities starting to register attacks by angry crows. Professor John Marzluff, an environmental scientist at the University of Washington, says he gathered evidence for the existence of “avenging crows” after subjecting the birds to a nasty Halloween-style incident in 2006 to see how they would react.
The university boss put on a man-eater mask and caught seven crows in a net, attaching identification tags to the birds…
