While he was moving back and forth in his swing, the idea of flying away occurred to him, but when he spread his wings up, they got hurt because of the size of his cage, it was too tight. So he tried to escape but he couldn't break the padlock that kept him locked, and form that day on you can hear him sing a sad and melancholy song about how much he would've liked to be a little canary instead of a human.
The end.
