The animal world is full of predators who can kill in the blink of an eye. These are the World's Deadliest: Split-Second Killers. Witness animal death strikes so fast, they can't even be captured in slow motion. Follow a cheetah on the hunt: As the fastest land animal in the world, it can go from 0 to 60 mph in three seconds. From the deadly snapping beak of the Humboldt squid, to the stabbing poison barbs of the cone snail, these speedy killers deliver death with an adrenaline-pumping rush.