 Vertebrate biologist Barbara Wueringer, of the University of Queensland, demonstrated that sawfish use their extended rostrum to detect and manipulate prey.She observed the animals' reaction to food already at the bottom of the tank, food falling from the water's surface, and introduced electric dipoles.When the sawfish came across scraps of fish resting on the bottom of the tank, it used its rostrum to pin the "prey" down as it swam over and engulfed it.