I'm confused by these 2 species.
In my observation, the ultramarine blue neck spot in Small Niltava is not always seen especially in absence of flash light. Two sets of photo recently posted on this forum presumably showing the same male Small Niltava can has different outlook. Please check:
http://www.hkbws.org.hk/phpBB2/viewtopic.php?p=9843&sid=e55fd9ff8d507c8f3b281d94f49de2ae#9843
and
http://www.hkbws.org.hk/phpBB2/viewtopic.php?p=9841&sid=e55fd9ff8d507c8f3b281d94f49de2ae#9841
Color of breast could be a useful feature to tell the different. But after searching on the web for their photo, I found that bill length and leg's color could provide a more definite answer. Hainan Blue Flycatcher is longer bill while Small Niltava is smaller. Unfortunately, Ken's photo not clear enough to show this feature, and I'm still not 100% convinced that it's Hainan Blue.
Gary
