#birds are so fascinating. Our white-capped #pionus broadcast a "bad bird alert" sound, and immediately our Maximilian's pionus re-broadcast the alert in his own dialect. The second bird wasn't even near a window, couldn't see the bad bird, but understood the alert and made sure it was relayed.
I've even seen this happen with sparrows alerting to something they saw, followed by our indoor birds, who saw nothing themselves, cross-species relaying to their flock.