As Read Montague points out, “sharks don’t go on hunger strikes”:

Piranhas were abundant, and the explorers were careful not to let their fingers skim the river’s surface. Theodore Roosevelt, after exploring an Amazon tributary in 1914, called the piranha “the most ferocious fish in the world.” He added, “They will rend and devour alive any wounded man or beast; for blood in the water excites them to madness. . .

This term comes from Peter Pirolli and Stuart Card’s “information foraging” research at Xerox PARC in which they drew parallels between people seeking information (“informavores”) and animals following the scent of their prey.