Igic and McLachlan managed to repeat the training process of throwing the glider while playing the sound eight times to ten fairy-wrens, and the fairy-wrens mastered the new vocabulary in just two days. Says Magrath, “I remember Jess and Brani bursting through the door, saying, “It worked!” Before the training, the fairy-wrens ignored the novel sound, but after training, they fled to cover just from playback of the new alarm sound, without the presence of the model sparrowhawk. Wild birds had succeeded in learning a new language.
