Yellowstone sets summer visitor record

This species is appearing in Yellowstone National Park in greater numbers than ever before: people.

More than 2.5 million visited the world's first national park during the June-to-August summer season. That's up by more than 200,000 compared with summer 2009, putting Yellowstone on track to set another attendance record. Nearly 3.3 million people visited during all of 2009.