Polar bear in Churchill, Manitoba, Canada (© karen crewe/Getty Images)

What's drawing scientists, travelers, and cameras to Manitoba, Canada, this week? Polar Bear Week is here, and it's more than a date on the calendar. For over a decade, Polar Bears International—a non-profit organization—has invited people to stream live cams and follow daily updates as the bears head to Hudson Bay. It's a week of learning and a call to protect a fragile ecosystem.