Dear MARMAM, While researching ways to classify the clicks of Beaked whales, there appeared a curious feature in one of the metrics being plotted in wavelet space. The original clicks, those coming from the whale, were typically below '1' in this value. Echoes, reflections, were above '1', sometimes by three orders of magnitude. It is possible a new means may be available for distinguishing the original click from its echo(es). Detections supporting this hypothesis are detailed in: http://tinyurl.com/2c72zsb However, it is just a theory until it can be verified. Thus, I am seeking collaboration with someone who would like to take a look at this recording and determine which are the source clicks and which are echoes using existing, conventional methods (that is, polarity or cross-correlation, et cetera). Then we could compare results and see if this new method is useful. Sincerely, Mark Fischer // info@aguasonic.com