Researchers at Sea Life Park Hawaii are working on a way to get humans even closer to our flipper friends: They\'re devising a common language of dolphin-like whistles. Already, dolphins recognize sounds for four words: ball, disk, leaf and barrel -- all of which are objects that the dolphins being tested are familiar with. \"We have developed a whistle word language -- words represented as whistles,\" said Dr. Ken Marten, director of the dolphin research initiative Project Delphis.