Listen to whales as they dive and search for food. Different whale specied tend to emit different noises and scientists are trying to determine the exact meaning of the different sounds. This is an area where 'amateur scientists' using a Dolphin Phone can contribute greatly to the general knowledge about the meaning of these 'vocalizations'. They seem to thrive in most marinas and in many bays and anchorages. They create a snapping noise with their large claw.
Scientists disagree as to the purpose of the snapping.
Some say it's a warning to other shrimp nearby. Others say the shrimp shoot out a jet of water from their claw to stun prey. Whatever the reason the snapping goes on day and night. You will also hear a lot of boats. Listen for the different sounds made by sailboats, power boats, Jet Skis, and different outboard motors on dinghys.