To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 1. Demonstration of a harbour porpoise repeatedly scanning its biosonar across two targets in a discrimination task. Courtesy of Magnus Wahlberg. Directional biosonar beams allow echolocating harbour porpoises to actively discriminate and intercept closely spaced targets Chloe E. Malinka, Laia Rojano-DoƱate, and Peter T. Madsen Journal of Experimental Biology 2021. 224:None-None; doi: 10.1242/jeb.242779 Download Original Video