What a difference the tide makes!
At high tide, and especially at high King Tide, no one (birds included) can walk on this sand without getting wet. The water laps around every square millimetre.
Contrast this with low tide. Now in truth, this photograph doesn’t tell the full story, for a really low tide goes out far more. It becomes quite impossible for any human to swim. Simply not enough depth of water.
Interesting, isn’t it?