The second bird was seen near Po Toi last year during a typhoon. BUT in July 2021 we now appear to have two different Brown Noddys ("Noddies "?)at the same time in HK.
A bird - HK’s third - that has been around for 3-4 weeks in Mirs Bay - presently delighting photographers east of Tap Mun Island. http://matthewkwanbirding.blogspot.com/2021/07/brown-noddy-mid-summer-twitch.html
AND FOURTH, found by people last week tern-watching on the Cheung Chau to Central Ferry, this bird I photographed today, 21st July, also from the back of the public ferry.