Yes, either can be used in HK.
The colour of the nape is the best, most easily seen from a distance. No other Eagle in HK show this colour on the nape.
The white on the shoulder is a deeper confirmation. By the time you see the white spots on the shoulder, the colour on the nape should be very obvious.
Outside HK, you need to use both.
HF Cheung
[ Last edited by HFCheung at 24/02/2011 10:20 ]