people wearing the mask days later were greeted with loud scolding cries and the formation of small mobs

The crows who were present for the banding scolded with more vigor

as time passed and the mask was worn out, The number of crows who scolded the mask multiplied.

when the mask was worn, the scolding and mobbing continued each time, for many years

The crows stopped reacting to the mask a year after the last banded crow had died.

researchers believe the crows told other crows about the danger