Conchs (pronounced either "kahn-k" or "kahn-ch") are snails and need their shells in order to survive. They're able to cap themselves inside their shells using the lid-like structure called the 'operculum'. In "true" conchs, this may also be used for stabbing! True conchs are typically able to be identified by a notch in their shells though this isn't always apparent. Some species have smooth shells while others have spiked shells.