There are bird species that use alarm calls to alert the presence of predators [1,2], some (including blue jays, another corvidae) even exhibit mobbing behaviou

There are bird species that use alarm calls to alert the presence of predators [1,2], some (including blue jays, another corvidae) even exhibit mobbing behaviour and will gang up (cooperating with other species!) to attack the predator [3]. [1] https://www.bl.uk/the-language-of-birds/articles/alarm-and-mobbing-calls https://www.bl.uk/the-language-of-birds/articles/alarm-and-m... [2] https://www.nationalgeographic.com/animals/article/nuthatches-chickadees-communication-danger https://www.nationalgeographic.com/animals/article/nuthatche... [3] https://en.m.wikipedia.org/wiki/Mobbing_(animal_behavior) https://en.m.wikipedia.org/wiki/Mobbing_(animal_behavior)