have a brain the size of a walnut, but they are incredibly smart. They stalk their prey at the water's edge and hold their breath for up to an hour. They also have a mouth that makes up 1/6 of their body length. They kill 1,000 people annually. However, only two species, the Nile and Saltwater crocodile, can be considered man-eaters. When their habitat overlaps the city limits, saltwater crocodiles move into the city in very small numbers. They have had to change their behavior very little to ad