See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. In something straight out of a childhood nightmare, a swarm of piranhas ...

Piranhas are among the most deadly creatures in the water, with razor-sharp teeth capable of slicing flesh easily, but a fish in the Amazon River basin has developed a "bulletproof vest" to protect ...

South America’s piranha family of fish — notorious as eaters of flesh — can be traced back to a single ancestor which dispersed when the Amazon was flooded by seawater some five million years ago, ...

Deep in the Amazon, there's a creature that defies expectations - pink river dolphins. In this episode, we get up close with these rare freshwater mammals and explore how they’ve adapted to life in ...