Arapaima gigas is a large Amazonian fish (weighing up to 150 kg) living primarily in seasonal lakes infested with ferocious piranhas. The freshwater giant has armor-like scales that can deform, but do not tear or crack, when a piranha attacks. According to a new study published in the journal Matter, these scales are one of the toughest flexible materials in nature. Arapaima gigas. Image credit: Shizhao / CC BY-SA 3.0. Arapaima’s adaptation naturally...
