Watch your step the next time you wade out into the ocean. You definitely don't want to bump into the deadliest, most venomous sea creature in the world: the box jellyfish. This skilled hunter has thousands of tiny stingers that shoot out poison that's strong enough to stop a human's heart in less than three minutes. Luckily, box jellyfish usually don't attack humans—unless a person comes too close! Packed with spectacular photos and fascinating facts, Box Jellyfish: Killer Tentacles introduces kids to the natural habitat, physical characteristics, diet, and behavior of these dangerous creatures. A narrative format will keep readers turning the pages for more.