What's got 3,000 tiny teeth and a 4-foot-wide mouth? The whale shark or "the friendliest shark in the sea," according to diver and photographer Jeff Rotman. But friendly or not, these school-bus-size fish can be intimidating as Jeff finds out! Join him on his quest to reveal the quiet mysteries of filter feeders such as the whale shark and basking sharks, and why these giant creatures need our help.