I don't know what are "normal" numbers of these species in the Can Gio area, but here are my sighting on the beach this morning. At least for me the number of terns was high. All the terns were resting together on the beach. I guess the Great Knot is not a common species here. The photo has an unusual format, but I try to include it. 150 Great Knot (forground, right-hand side); 110 Caspian Tern; 200+ Little Tern; 80+ Whiskered Tern Arild
Sounds like you are seeing lot's of lovely birds on your patch at the moment.
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