This work by Wilde has been critically reviewed for the possibility that this was Wilde's own cries and inner battles trying to "find new sensations". Wilde was notorious for saying how all sensations must be experienced freely, as his mentor Walter Pater would also avow.
Hence, the sacrificial nature of the Bird is much reflective of Wilde himself during his last years, when he sacrificed his freedom for the love of his male lover, and against the statutes of Victorian Law. And, as the bird, Wilde also did it maybe all in vain- life went on as usual, even after he tried to do the heroic act of accepting himself in society.