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Julian,
An odd story. Certainly nothing to do with hybrids!
Also not that "did the koel lay its eggs in the PC's nest
and the young PC learn the call" because you are (I assume) talking
about the call of an adult koel which a young PC would not learn from a nestling
koel. Besides, mostly host chicks don't survive a baby cuckoo and koels don't
parasitise PC anyway (Channel-billed Cuckoos do). It could be mimicry, although
that is not a strong point of PC but magpies & butcherbirds do it so no
reason why the occasional PC wouldn't. My suggestion is that it may be a young
PC learning to call and at this time of year many young birds come out with odd
sounds. The young Magpie-larks in particular are doing this
now.
Philip
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