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Gray whales make one of the longest migrations of any mammal on earth. Every year of their lives they swim more than 10,000 miles in a roundtrip migration between nursery lagoons in Mexico and feeding grounds in the Arctic. These gentle giants are on a perpetual journey for survival as they respond to seasonal changes in their ocean habitat. This slideshow provides a glimpse into their mysterious world, and explores factors that drive the endless travels of the magnificent gray whale. You're invited to to track the monumental migration live each spring with Journey North.