We spent Sunday afternoon exploring the tidepools at Cabrillo National Monument, which sits at the end of Point Loma at the entrance to San Diego Bay.
When the tide goes out, hundreds of shallow spots and divots in the rocks are left filled with water and all sorts of sea creatures such as crabs, tiny fish, hermit crabs, anemone and even an occasional octopus.
They're like naturally occurring saltwater aquariums.
But don't worry. All of the critters get to escape their rocky prisons when the tide returns.