a german cruise company says the polar bear attacked a guard during a tour of the arctic. the company says another guard then shot and killed the bear in self-defense. the injured guard was air lifted out with head injuries and is in stable condition. this happened on norway's remote northern island known as the realm of the polar bear. it's halfway between norway and the north pole. joining me now to discuss, wildlife expert jeff corwyn. what's your reaction to this? >> well, fredricka, it's incredibly tragic. what really is most disturbing about this is that polar bears, despite their prowess and their great size and strength, their ability to survive in one of the most hostile ecosystems on the planet, they are critically endangered and are slipping towards extinction. when there's only 25,000 polar bears left on the planet, every one matters. >> and we don't know all of the