Over the past year, there were 80 reported human grizzly encounters and while 80 percent of those people walked away unharmed, that wasn't the case for two Yellowstone visitors.

"We had two people killed last year in Yellowstone Park and both of those people walked by signs that specifically told them not to do stuff that they did," says U.S. Fish and Wildlife Service's Chris Servheen.

That's why Servheen wants to figure out how to better spread the message of bear safety.

"We don't seem to be very successful in getting the message to people about how they behave," says Servheen.

He's looking at who's encountering bears, where they were and what they were doing. So far, Servheen has found the majority of people were hunting or hiking and not carrying bear spray.

"That's just disheartening to us. We've tried to be very specific about that and relentless in the messaging about that but, for whatever reason, people don't seem to take it to heart," says Servheen.

Steve McEwan is a sales associate at Bob Wards. He says they sell 100's of bottles of bear spray each year but that many people still don't know how to use it.

"I would recommend them to always carry it on their hip or, if they are mountain biking, they can carry it in their water bottle holder on their mountain bike. You have to have it readily available. If it's in your backpack in the bottom of the pack or something like that, you're not going to be able to get to it fast enough," says McEwan.

Experts say there are a lot of factors that play into the increase of encounters, like an increase in the bear population. Yet, Servheen says it only takes one.

He urges people to take precautions in bear country: make noise on the trail, avoid hiking alone, don't run if faced with a bear and always carry bear spray.

"If people did those four things, they would be a lot better off in bear habitat and very likely, perhaps, those people who died last year would still be alive today," says Servheen.