Why the attacks?
"The reason why we're having bear attacks now is because we have vacationers out in the areas where bears live," said Tom Stalf, CEO of the Columbus Zoo. The bears are "out foraging and looking for food."
Stalf said the migration of humans is another reason for more bear encounters.
"It's called urban sprawl," he said. "As we vacation and we move out of the cities and into the country, we're going to cross paths with different types of animals."
But Harry Reynolds, vice president of the International Association for Bear Research and Management, said sometimes it's just luck.
"I think the recent attacks are circumstance and not any larger outside issue weighing into the attacks," he said. "In past years in Alaska, when there are berry failures, the bears may be more aggressive in looking for food. But this year was a good crop. I really think the recent bear attacks are just circumstance -- people in the wrong time at the wrong place."