Working with Dr. Denise Herzing of the Wild Dolphin Project, we are creating wearable computers for conducting two-way communication experiments with cetaceans. With CHAT, one researcher uses the waterproof system to broadcast a sound, associated with an object with which dolphin's like to play. A second researcher, upon detecting the sound, passes the object to the first. The researchers pass objects back and forth, further associating the sound with the object. The goal is to see if the dolphins mimic the sound in order to "ask" for the play object. The wearable computer uses pattern recognition technology to detect these mimicked sounds. In a more long-term effort, UHURA uses pattern discovery techniques in an attempt to uncover fundamental units of dolphin vocalizations.