Why Study Loon Vocalizations? Studying loons as a graduate student, I became quite interested in the mechanisms by which loons select and actively defend breeding territories. Dr. Charles Walcott at Cornell University really helped me explore ideas as to how vocal communication plays into this process. It's quite interesting that, although the loon vocal repertoire is one of the most characteristic features of the northern wilderness, we know very little about what these individuals are saying about themselves and to each other through their fascinating vocal signals. We've only begun to learn about these intriguing calls.