Episode Detail: Giants of the Deep; Two Years in the Galapagos - National Geographic Explorer
Weighing close to 200 tons, and with tongues as large as elephants, the blue whale is the largest animal to ever roam the world. Here, scientist John Calambokidis travels to the Costa Rica dome to study the creatures. Also: David Parer, Elizabeth Parer-Cook and their 3-year-old daughter have adventures in the Galapagos Islands.