Every beluga whale develops a unique “contact call” – almost like a name. It’s how each whale distinguishes him/herself from every other beluga in gatherings that can number into thousands of other whales. It's how mothers and calves stay in touch. In this short video, you'll hear these contact calls as Dr. Valeria Vergara explains how mothers teach them to their young. This is the second in a series of highlights from Dr. Vergara's complete "Beluga Babble" webinar with Whale Sanctuary Project P

Two formerly captive beluga whales, Little Grey and Little White, were successfully released into the world's first open-water sea sanctuary for beluga whales in Iceland. | Reuters