It isn't easy to capture an image of a beaver underneath the ice. It's cold, the water is murky, wild animals have their own schedules, and did we mention it's cold? But National Geographic photographer Ronan Donovan didn't let these difficulties stop him from trying for three years. Learn more about Ronan's photography process for photographing beavers underwater, and discover the role their dams play in protecting habitats from forest fires: https://on.natgeo.com/4mEvKt4 | National Geographic