Movie 1.

Tag placement on killer whale. Video from the CATS tag shows the placement of the tag on the killer whale's mid-lateral chest, posterior to the left pectoral flipper.

An accelerometer-derived ballistocardiogram method for detecting heart rate in free-ranging marine mammals

Max F. Czapanskiy, Paul J. Ponganis, James A. Fahlbusch, T. L. Schmitt, and Jeremy A. Goldbogen

Journal of Experimental Biology 2022. 225:None-None; doi: 10.1242/jeb.243872