There are oysters that open their shells at high tide and close them at low tide, regardless of the coastal areas.

Why, so well timed is the appearance of grunion (fish) on Southern California beaches for their ‘mating dance’ that newspapers publish the precise time of their arrival. Even certain microscopic algae have a 24-hour rhythm, giving off a phosphorescent glow for 12 hours of the night.

◻ Salmon: Internal clocks indicate time to return from the sea to the river where they were spawned.