but that world is not like that anymore. >> there's no need to avoid nature, jack hanna says. just take along some spray and a healthy dose of awareness. to illustrates, he talks about a story of trapping a grizzly bear. >> we took rubber bullets and hit him in the butt. and we did that because why? >> to scare him. >> he will say these people are not nice people. people aren't nice, so let's stay away from people. >> when they're cute like this it's hard to remember they're wild, unpredictable hunters who have to learn for their good and ours to fear humans once again. this is vicki mabry for "nightline" in new york. >> the delicate balance between man and beast. our thanks to vicki for that. >>> when we come back, he left the football field for the battlefield. tonight, new revelations about the life and death of pat tillman. ments that make every day special. fancy feast introduces an entirely new way to celebrate any moment. fancy feast appetizers. simple high quality ingredients like wild alaskan salmon, white meat chicken, or seabass and shrimp in a delicate broth, prepa