How close do sharks come to coastal shorelines? Closer than you may think. A recent study from the University of Miami says sharks – one of the largest predatory fish in the ocean – are moving closer to the world's coastlines. Researchers believe sharks prefer coastal waters due to fish carcasses discarded by fishermen and local fish businesses. Finding an abundance of food will lure them closer to beachfront. Water temperatures also play a part in shark behavior. As summer's water temperatures rise, the likelihood of sharks traveling into warmer coastal waters is higher. Here's what to know about sharks as you head to the beach.