Charadriiformes is the main focus so many photos of gulls were taken even without a certain ID, still, I think gulling in other places are is much funnier than in HK.
Highlights include Black-tailed Gull, Pallas's Gull, Little Tern, Sharp-tailed Sandpiper and Nordmann's Greenshank.
Checklist is here https://ebird.org/checklist/S66349316 and my BigEar2020 is now 159.
Nordmann's Greenshank, Common Greenshank and Black-tailed Godwit
mainly Black-tailed Godwit
Nordmann's Greenshank - note the color tone difference
Nordmann's Greenshank and Northern Shoveler
Nordmann's Greenshank and Common Greenshank - see the size, bill shape, pattern difference
Saunder's Gull in summer plumage is the main character here
Nordmann's Greenshank, Common Greenshank and Marsh Sandpiper
Nordmann's Greenshank
Nordmann's Greenshank and Marsh Sandpiper
Black-headed Gull
Nordmann's Greenshank - take off
Western Osprey
Kentish Plover
Greater Sandplover
Greater Snadplover
Common Sandpiper
Black-tailed Gull - first winter, one of the easiest IDable first winter gulls here
Black-faced Spoonbill
Black-faced Spoonbill
Black-faced Spoonbill
Black-faced Spoonbill - at least an endangered species
Black-faced Spoonbill
Terek Sandpiper
Terek Sandpiper
Terek Sandpiper
Identification of immature herring gull species is always challenging, so I can be wrong as always, I would say this is a first winter Lesser Black-backed Gull, I expect first winter Herring should show much whitish head in this time of year
two first winter Lesser Black-backed Gull - the left one show some Slaty-backed jizz
Caspian Tern
third winter Lesser Black-backed Gull - an interesting molt in this individual but showing pale iris, yellow bill with dark spot is feature of thrid winter
first winter Lesser Black-backed Gull in flight - very dark upperwing pattern and starting to molt in mantle
Lesser Black-backed Gull, Black-tailed Gull and Caspian Tern
Black-tailed Gull and Lesser Black-backed Gull
first winter Herring Gull ? and Lesser Black-backed Gull - the noise is real in D850
adult summer Pallas's Gull and Lesser Black-backed Gull - the black head is always distinctive
Pallas's Gull and Black-tailed Gull
Lesser Black-backed Gull
Lesser Black-backed Gull and Caspian Tern - sometimes adult gulls are easier to be identified, as here, Lesser Black-backed always shows limited mirror on wings, usually a small one restricted to p10 only.
mostly Lesser Blac-backed Gull - is the left one Herring? showing whitish head and paler underwing
Herring Gull? more whitish head and paler underpart
Herring Gull and Lesser Black-backed Gull in the middle - note the much more paler upperwing patterns, especially the wing panel and the inner primary
Herring Gull
Lesser Black-backed Gull
Lesser Black-backed Gull
Lesser Black-backed Gull - the middle one show color tone and eye pattern of Slaty-backed Gull, but first winter Slaty-backed Gull does not show any terminal tail band as this individual
Lesser Black-backed and Herring Gull - challenging right? especially no upperwing seen
Lesser Black-backed Gull
Lesser Black-backed Gull
two Pallas's Gull
two Pallas's Gull
Herring Gull
Norther Shoveler
adult Lesser Black-backed Gull - still in winter plumage which they molt later than the Herring Gull (mongolicus)
Black-faced Spoonbill
Black-faced Spoonbill
Pied Avocet
Great Egret
Great Egret
Black-faced Spoonbill
Far Eastern and Eurasian Curlew
Far Eastern and Eurasian Curlew
Far Eastern Curlew
Common Redshank
Common Redshank
Grey Plover and Great Knot
Herring Gull (mongolicus) likely - note the two big mirror and more paler upperpart (saddle), of course, the grey color tone is always affected by sunlight. The full whitish head is a clue of summer plumage, which Herring Gull (mongolicus) molt earlier than Lesser Black-backed
Common Redshank in majority, also a Marsh Sandpiper inside
Common Redshank - the upperwing pattern is also distinctive in other Tringa species
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