Scientists have discovered that dolphins can call out to each other by using names. When separated, dolphins were found to whistle similarly to other dolphins that wander away from the group. … “This study provides evidence that copies of signature whistles include elements that differ from the whistles of the original whistler, while still maintaining the changes in frequency over time that allow a listener to identify the original whistler,” said Heidi Harley, professor of psychology at New College of Florida.