I asked at the information point but they told me the bird hadn't been observed this day. I went to the Cal Tet hide and I mounted my scope. There weren't so many birds as last week but it still was nice. There was a Great Crested Grebe only a few meters from the hide, a Gull-Billed Tern, some Geese and even a Purple Heron flew past.
After some time observing and taking photos of the swallows I decided to go to the beach observation tower. On the way, you go paralel to the rivermouth. As I was walking there, I saw two birds flying very close to me, they were terns. I looked with my binoculars and I could ID them as Black Terns, a lifer. I climbed up to the tower and started looking. There were some waders, like Dunlins, Grey Plovers or Oystercatchers and some Ducks.
Great Crested Grebe