Fleeing isn’t the only way by which songbirds can protect themselves against predators. Many songbird species are known to engage in mobbing, where they gather aggressively around a bird of prey, flying rapidly while making stereotypic movements and loud vocalizations. Mobbing is risky for both parties: birds of prey have been observed to attack their mobbers, while cases are known of mobbing songbirds injuring birds of prey.
Click here for original story, Songbird species work together to mob predator owls, but only strike when the time is right
Source: Phys.org