The gray whale or Eschrichtius robustus is one of the balleen
whales that feeds on plankton it sieves through the balleen plates embedded in its jaw. There were three large populations of gray whales, but the North Atlantic gray whales were assumed to have been hunted to extinction in the 18th century, while the American population is fairly healthy, the Asian gray whales of the North Pacific are endangered. The gray is famous in particular for its extensive annual migration, the longest migration of any whale, and one of the world's longest migrations of any species in yearly round trip of 15,000-20,000 kilometers.
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