What if every Superb Fairy-wren used the same note? Then it's not a name, it's a hard-wired cry.
What's A Name?
Ed Yong, in his wonderful blog Not Exactly Rocket Science considered this question last year, and reported that the science papers say the notes used by chicks in different nests are not the same. They vary from brood to brood. They aren't innate. Different parents in different nests used different notes.
Even though cuckoo eggs get incubated alongside the wren’s eggs, they don’t have enough time to learn the pass-note. The lessons begin 10 days after the eggs are laid, which gives the wren embryos around 5 days to learn the call. Cuckoo eggs only get about 2 days, meaning that fairy-wrens can leave the cuckoos behind.
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