Along the murky bottom of the Amazon River, serpentine fish called electric eels scour the gloom for unwary frogs or other small prey. When one swims by, the fish unleash two 600-volt pulses of ...

With a trunk-like snout, an enormous brain and shimmying moves, freshwater elephantnose fish seem straight out of a science-fiction novel. But these oddballs’ most shocking trait is their ability to ...