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3 WBSEs over Sai Kung

Immature - see page 122 of Brazil - Birds of East Asia

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Yes I agree. sub-adult is better - I guess it's fourth year. But this is a plumage I don't recollect having seen before - I was quite surprised to find it displayed in Brazil.

I don't know if there is a generally accepted technical definition of juvenile, immature and sub-adult.

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