Why aren't Southern Right Whales recovering after whaling stopped?

Each winter southern Australia hosts the return of Southern Right Whales from Antarctica, who come to warmer waters to calve. These mysterious whales were hunted almost to extinction during commercial whaling, but unlike other whales, their recovery has been much slower. New research suggests it may even have stalled.To find out why, and what that means for the oceans, we speak to researcher Anne Grundlehner at the Institute for Marine and Antarctic Studies at the University of Tasmania. Her answers offer a fascinating insight into the world of these whales.Image: Southern Right Whale mother and calf. robdownunder/Flickr