This is the place where, in 1963, Chinese ornithologists discovered that the Yellow-billed Nuthatch, Sitta solangae, occurred in China - it was known to occur in Vietnam already.
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Robert Swinhoe shot a specimen of Orange-bellied Leafbird there in 1860. It had a blueish crown, hence the race lazulina
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Hainan has many distinct races - some more distinct than others.....