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Nectarina calcostetha
Looks like other sunbird females but has a greyish head. Upperparts dark olive; throat and under tail coverts greyish; breast and belly greenish yellow; tail black with bold white tips.
The Copper-throated Sunbird is found mainly in mangroves, but also coconut groves and coastal scrub. Singapore and in fact Sungei Buloh Nature Park, is said to be one of the few places where there is good chance of seeing this bird!