A study at the University of California, Davis, US, by Teresa Iglesias and some of his colleagues revealed that birds hold funerals for their dead. When western scrub jays find a dead body they call out one another and stop foraging for food (which last for over a day). Then they fly down to the dead body and gather around it.
By making sound like “zeeps”, “scolds” and “zeep-scolds” they try to warn distance birds which also encourages them to attend the dead.
Researchers say, “spreading the message that a dead bird is in the area helps safeguard other birds, alerting them to danger, and lowering their risk from whatever killed the original bird in the first place.”