So what are the whales thinking about? Are they just bendy-bus-sized krill-obsessed tubes of feeding blubber? Do they have a laugh, scattering seahorses with their massive built-in underwater air-horns? Actually, it appears they have a complex intelligence, evidenced by their rich and varied communications. Their songs boom, click and whistle through the oceans, and show suggestions of language, dialect and individuality. With a New Zealand connection, this fascinating documentary shows the dedicated scientist sea-nerds looking for the rosetta stone of whale chat. It’s a great family watch, with the caveat that the feature whale species has a PG-13 name: The Humpback.

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