It takes 6 hours for the tide to go out and expose the rock pools and 6 hours for the tide to come in again and cover the beach.
This video shows the tide covering the rock with water and the top shells moving around.
Busy top-shells from Paul Naylor.
One of the hermit crabs in this video wants the other ones shell ‘home’ watch what happens!
This video shows how the barnacles feed when the tide is in.
Barnacles feeding from Paul Naylor.