Like humans learning to speak, juvenile birds learn to sing by mimicking vocalizations of adults of the same species during development. (oist.jp)
They will be transported and slaughtered in similar facilities at a young age, when they are in fact still just juvenile birds. (makeitpossible.com)
They monitored the neuronal auditory response when the birds listened to different songs - their own, the tutor, other zebra finches, and the songs of different songbird species - in tutored juvenile birds and in isolated juvenile control birds. (sciencedaily.com)