On this week's "60 Minutes Presents," more sharks are being spotted near beaches in the North Atlantic Ocean, some just feet from the shoreline. We report on why the sharks are swimming so close and how scientists are tracking them. In the dead of winter, 60 Minutes went looking for wolves in Yellowstone National Park, and we weren’t alone. These fierce and feral animals are the darlings of tourists willing to endure frigid temperatures to catch a glimpse of a distant pack crossing a snow-covered ridge. Finally, National Geographic photographer Joel Sartore shows 60 Minutes how his shots come together and why he started his Photo Ark project.

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