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ZEISS DTI thermal imaging cameras. For more discoveries at night, and during the day.

Singapore Bothanic Gardens Jan 2018 Swifts (1 Viewer)

I have this ones to confirm I.D.

1.House swift
2.House swift
3.whiskered treeswift
4.whiskered treeswift
 

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1-2 are Swiftlets, possibly Black-nest but probably not identifiable.

3-4 are Grey-rumped Treeswift (reddish ear-coverts denote a male).
 
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