Isn’t that something? They can actually recognize individual songs of other species that live with them or nearby.https://www.technology.org/2018/05/31/d … r-species/
When my cockatiel, Bubba, got loose Sweetie was all alone and calling to him. A male red bird befriended her and spent a lot of time on the banister outside the sunroom where Sweetie was. They communicated and Sweetie even picked up some of his language.