According to an article published by the San Francisco Chronicle last week, a humpback whale became entangled by crab trap lines near the Farallon Islands along her migratory route. Divers from the Marine Mammal Center in Marin County worked for hours with curved knives and were able to free her from the lines in the first successful attempt of this nature ever conducted. In return, the divers reported, she swam up to each and every diver, one at a time, and nudged them, pushing them gently around as if to say ‘thank you.’