The answer is a 70-foot long sperm whale. A sperm whale that follows fishing boats, waits until it hears the engines throttle up to haul their fishing lines in and then carefully strips the cod (not the other fish) off the hooks as they get hauled up.

In the Gulf of Alaska, sperm whales started doing this in the 70's. Now, it's happens enough that they've had to tag some of the whales so they can be tracked by satellite and the fishermen can avoid the ones they call the "bad boys". One of them is so good at this tactic that they call him "Jack the Stripper".

The BBC and some researchers finally caught some of these whales on video "in the act", and put the footage it in a documentary called "Alaska: Earth's Frozen Kingdom".

Here's the article, with the video clip.


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