When scientists want to study the long-distance movement of marine animals, they will instrument them with a small device called an acoustic transmitter—or tag—which emits unique signals or “pings.” These signals are picked up by receivers anchored to the seafloor that record the date and time of each detection when the tagged animal comes within range. When scientists want to study the long-distance movement of marine animals, they will instrument them with a small device called an acoustic transmitter—or tag—which emits unique signals or “pings.” These signals are picked up by receivers anchored to the seafloor that record the date and time of each detection when the tagged animal comes within range. Ecology Molecular & Computational biology Phys.org – latest science and technology news stories